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                                                                  EXHIBIT 10(o)




                                AMENDED AND RESTATED

                                  CREDIT AGREEMENT

                                  for an amount of

                                       up to

                                  USD 2,250,000.00

                                         to

                           SOUTH HAMPTON REFINING COMPANY

                                    provided by

                                DEN NORSKE BANK ASA

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                                   I N D E X

    1.   DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . .   1

    2.   AMOUNT AND PURPOSE . . . . . . . . . . . . . . . . . . .   7

    3.   CONDITIONS PRECEDENT . . . . . . . . . . . . . . . . . .   8

    4.   EXTENSION RENEWAL AND AVAILABILITY . . . . . . . . . . .  10

    5.   INTEREST . . . . . . . . . . . . . . . . . . . . . . . .  10

    6.   REPAYMENT. . . . . . . . . . . . . . . . . . . . . . . .  11

    7.   PREPAYMENT . . . . . . . . . . . . . . . . . . . . . . .  12

    8.   SECURITY . . . . . . . . . . . . . . . . . . . . . . . .  12

    9.   REPRESENTATIONS AND COVENANTS  . . . . . . . . . . . . .  12

    10.  CHANGES IN CIRCUMSTANCES . . . . . . . . . . . . . . . .  18

    11.  FEES, COSTS AND EXPENSES . . . . . . . . . . . . . . . .  19

    12.  PAYMENTS . . . . . . . . . . . . . . . . . . . . . . . .  19

    13.  CALCULATION  . . . . . . . . . . . . . . . . . . . . . .  20

    14.  EVENTS OF DEFAULT  . . . . . . . . . . . . . . . . . . .  20

    15.  CHANGE OF CONTROL  . . . . . . . . . . . . . . . . . . .  23

    16.  NOTICES AND CORRESPONDENCE . . . . . . . . . . . . . . .  23

    17.  GOVERNING LAW AND JURISDICTION . . . . . . . ... . . . .  24

    18.  FINAL AGREEMENT  . . . . . . . . . . . . . . . . . . . .  24

    19.  COUNTERPARTS . . . . . . . . . . . . . . . . . . . . . .  24



    Exhibit A - Form of Promissory Note

    Exhibit B - Form of Borrowing Base Certificate

                                       i



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         Amended and Restated Credit Agreement dated __________ , 1998 (the 
    "Restated Agreement") between South Hampton Refining Company, a Texas
    corporation (the "Borrower") and Den norske Bank ASA, New York Branch, a 
    Norwegian bank (the "Bank").

        WHEREAS, the Borrower and the Bank entered into the Amended and
    Restated Credit Agreement dated October 15, 1996 as amended and restated
    from time to time (as so amended and restated, the "Credit Agreement"); and

        WHEREAS, the Borrower and the Bank wish to amend and restate the Credit
    Agreement to modify certain provisions of the Credit Agreement and to
    embody all of the amendments made to the Credit Agreement in one document.

        NOW, THEREFORE, in consideration of the above recitals and other good
    and valuable consideration, the receipt and sufficiency of which is hereby
    acknowledged, the parties hereto agree to amend and restate the Credit
    Agreement to read in its entirety as follows:

1.     DEFINITIONS

    "Advance"                 means the loans by the Bank to the
                              Borrower pursuant to Section 2 hereof.

    "American Shield"         means American Shield Refining Company, a 
                              Delaware corporation.

    "Arabian Shield"          means Arabian Shield Development Company, a 
                              Delaware corporation.

    "Banking Day"             means a day upon which banks are open for
                              business in such places contemplated for the
                              transactions required by this Restated Agreement.

    "Borrowing Base"          means the aggregate of (i) 90% of cash of
                              the Borrower held in the Cash Collateral
                              Accounts, (ii) 80% of Eligible Accounts
                              Receivable and (iii) 60% of Inventory.

    "Borrowing Base           means a certificate in the form of Exhibit B
     Certificate"             attached hereto.

                                                                         Page 1

    Amended and Restated Credit Agreement




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    "Cash Collateral           means the accounts at a designated depositary 
    Accounts"                  bank acceptable to the Bank providing for the 
                               payment of all the Borrower's receivables to a
                               designated account or accounts under the joint
                               control of the Borrower and the Bank.

    "Closing Date"             means November 30th, 1998.

    "Commitment"               means an amount up to USD 2,250,000.00 on the 
                               Closing Date, reducing (i) on the last day of
                               each fiscal quarter of the Borrower commencing
                               December 31, 1998 by the sum of USD 105,000,
                               (ii) by the amount of any Distribution made
                               under Section 9(d)(ii) on the date such
                               Distribution is made, and (iii) on each of the
                               first five (5) Payment Dates hereunder, by the
                               sum of USD 40,000.

    "Credit Facility"          means the revolving credit facility, the terms 
                               and conditions of which are set out in Section 2 
                               of this Restated Agreement.

    "Current Ratio"            means the ratio of the current assets of the 
                               Borrower to its current liabilities as each
                               would be classified as current assets or
                               liabilities in accordance with generally
                               accepted accounting principles in the U.S., of a
                               corporation conducting a business the same as or
                               similar to the business of the Borrower, but
                               excluding receivables from or payables to any
                               subsidiary, parent or affiliate of the Borrower.

    "Distribution"             means a distribution by the Borrower to a Parent
                               Company in respect of dividends.

    Amended and Restated Credit Agreement                         Page 2

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    "Eligible Accounts         means all accounts receivable which have been
     Receivable"               created in the ordinary course of Borrower's 
                               business and for which Borrower's right to
                               receive payment is absolute and not contingent
                               upon the fulfillment of any condition whatsoever,
                               and shall not include (a) any invoice of a
                               customer which remains unpaid more than 90 days
                               from its invoice date, (b) any account for which
                               there exists a right of set off, counterclaim,
                               dispute, objection, complaint, defense or
                               discount,(c) any account which arises from the
                               sale or lease to or performance of services for,
                               or represents an obligation of, an employee,
                               affiliate, partner, parent or subsidiary of
                               Borrower, (d) that portion of any account from a
                               customer of Borrower which represents the amount
                               by which Borrower's total accounts from such
                               customer exceeds 25% of Borrower's total
                               accounts,(e) any account arising from a sale or
                               lease to a non-United States or non-Canadian
                               customer, and (f) any account designated to
                               Borrower by the Bank in which the Bank is not or
                               does not continue to be, in the Bank's reasonable
                               judgment, satisfied with the credit standing of
                               the customer of Borrower in relation to the
                               amount of credit extended. 

    "Fixed Charge Coverage     means the ratio of (a) the earnings of the   
     Ratio"                    Borrower excepting extraordinary items of
                               gain or loss, but without deduction for interest,
                               taxes, depreciation and amortization to (b) the
                               aggregate of scheduled payments of principal of
                               all debt of the Borrower and interest thereon.

    "GAAP"                     means generally accepted accounting principles in
                               effect in the United States.



    Amended and Restated Credit Agreement                              Page 3


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    "Hazardous Substance"      means any hazardous, dangerous or toxic waste,
                               substance or material as defined in the
                               Comprehensive Environmental Response,
                               Compensation and Liability Act of 1980, 42 U.S.C.
                               Sec. 9601 et sea. (hereinafter, "CERCLA"); the
                               Resource Conservation and Recovery Act, 42 U.S.C.
                               Sec. 6901, et seq. (hereinafter, "RCRA"); the
                               Hazardous Materials Transportation Act, 49 U.S.C.
                               Sec. 1801, et seq.; the Texas Solid Waste
                               Disposal Act, Tex. Rev. Civ. Stat. Ann. Art.
                               4777-7 Sec. 13(g)(7); or any other federal, state
                               or local statute, law, ordinance, code or
                               regulation relating to or imposing liability or
                               standards of conduct concerning the use,
                               production, generation or disposal of any
                               hazardous, toxic or otherwise dangerous waste,
                               substance, or material, currently or at any time
                               hereafter, in effect.



    Amended and Restated Credit Agreement                         Page 4

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    "Inventory"                means any and all of Borrower's right, title and
                               interest in and to inventory, wherever
                               located, and in which the Bank has a perfected
                               security interest, including without limitation,
                               any and all goods held for sale or lease
                               or being processed for sale or lease in
                               Borrower's business, as now or hereafter
                               conducted, including without limitation, all
                               feed stock, materials, goods, and work-in-
                               progress, finished goods, and other tangible
                               property held for sale or lease or furnished or
                               to be furnished under the contracts of service
                               or used or consumed in Borrower's business,
                               along with all documents (including documents
                               of title) covering inventory, all cash and
                               non-cash proceeds from the sale of inventory
                               including proceeds from insurance and
                               including such property the sale or other dispo-
                               sition of which has given rise to accounts and
                               which has not been returned to or repossessed
                               or stopped in transit by Borrower, but
                               specifically excluding obsolete or slow moving
                               inventory.

    "Margin"                   means 1% (one percent).

    "Maturity Date"            means December 31, 2000 or as extended in the
                               sole discretion of the Bank.
                               
    "Net Income"               means net income of the Borrower as determined 
                               in accordance with GAAP.

    "Parent Company"           means American Shield Refining Company, Arabian
                               Shield Development Company and Texas Oil & 
                               Chemical Co. II, or any combination thereof.

    "Payment Date"             means the last day of each month during the term
                               of this Restated Agreement.

    "Permitted Distribution"   shall have the meaning set forth in Section 9(d)
                               hereof.


    Amended and Restated Credit Agreement                         Page 5


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    "Prime Rate"               shall mean the rate announced from time to time 
                               by the Bank as its prime lending rate in effect
                               in its New York, New York office, automatically 
                               fluctuating upward and downward with and at the 
                               time of each such announcement without special 
                               notice to Borrower or any other Person. The 
                               Bank's prime rate may be one of several interest
                               rates, may serve only as reference rate and may 
                               not be the Bank's lowest rate. 

    "Required Commitment       means for any period, those amounts by which the
     Reduction"                Commitment is reduced pursuant to clause (i) of
                               the definition of "Commitment". 

    "Saudi Fal"                means Saudi Fal, a limited liability company.

    "Security Documents"       means all or any documents pursuant to Section 8
                               hereof, as have been or may be entered into as
                               security for all or any of the obligations of
                               the Borrower hereunder.

    "Tangible Net Worth"       means, at a particular date, the sum of the 
                               capital stock (excluding treasury stock) and
                               surplus (including earned surplus, capital
                               surplus and the balance of the current profit
                               and loss account not transferred to surplus)
                               prepared in accordance with GAAP as of the date
                               of determination, excluding, however, from the
                               determination, all inter-company transactions
                               and after deducting therefrom the net book value
                               of all assets (after deducting any reserves
                               applicable thereto) which would be treated as
                               intangibles under GAAP, including, without
                               limitation, such items as good will, trademarks,
                               trade names, patents and licenses, franchises
                               and operating rights), of the Borrower.

    Amended and Restated Credit Agreement                         Page 6



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    "Tax"                      means all or any levies, imposts, duties,
                               charges, fees, deductions and withholdings
                               levied or imposed by any national or local
                               governmental or public body or authority (except
                               for United States federal, state and local income
                               taxes levied on the Bank's gross income or 
                               receipts or United States federal, state and 
                               local gross receipts or franchise taxes levied in
                               lieu of income taxes) and any restrictions or
                               conditions resulting in a charge.

    "TOCCO II"                 means Texas Oil & Chemical Co. II, Inc., a Texas
                               corporation.

    "USD"                      means the lawful currency of the United States of
                               America.

    Where the context of this Agreement so allows, words importing the singular
    include the plural and vice versa.

    2.   AMOUNT AND PURPOSE

         (a) The Bank shall make available the Commitment as follows:

         USD 2,250,000.00 which shall be used by the Borrower for the purpose
         of refinancing, renewing and extending the loan evidenced by its
         Promissory Note dated December 30, 1990, as amended or restated from
         time to time (the "Old Note"); and

         (b) The Commitment shall be drawn down by the Borrower in the form of
    Advances for a term which shall not extend beyond the Maturity Date. The
    total amount of Advances outstanding under the Credit Facility shall not
    exceed at any time the lesser of the Commitment and the Borrowing Base.
    Within such limit, the Borrower may borrow, prepay pursuant to Section 7 of
    this Restated Agreement and reborrow under this Section 2(b). Each borrowing
    by the Borrower shall be in an aggregate principal amount of at least USD 
    50,000.

         (c) The Commitment shall be evidenced by the promissory note of the
    Borrower in the form of Exhibit A attached hereto (the "Note").

    Amended and Restated Credit Agreement                         Page 7


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         (d) Notwithstanding anything else in this Restated Agreement, at no
    time shall there be outstanding Advances in an amount in the aggregate
    greater than the lesser of the Commitment and the Borrowing Base.

    3.   CONDITIONS PRECEDENT

         3.1 The Borrower shall give the Bank at least one Banking Day
    irrevocable prior written notice of its desire to have an Advance made.

         3.2 The obligation of the Bank to make the first Advance under this
    Restated Agreement shall be subject to the Bank or its legal counsel having
    received in form and content satisfactory to the Bank:

         (a) The counterparts of this Restated Agreement duly executed by the
    Borrower's authorized representative or representatives.

         (b) The Security Documents.

         (c) Copies certified by the Secretary of the Borrower of:

             (i)   the By-Laws of the Borrower,

             (ii)  The resolutions of the Board of Directors of the Borrower
                   approving the execution, delivery and performance by the
                   Borrower of this Restated Agreement, the Note, the Security
                   Documents and specifying the persons authorized to sign the
                   above mentioned documents on its behalf.

         (d) Any consents necessary from governmental or other authorities for
    the execution, delivery and performance by the Borrower of this Restated
    Agreement.

         (e) A copy certified as of a recent date by the Secretary of State of
    Texas of the Articles of Incorporation of the Borrower with all amendments
    thereto.

         (f) Evidence from the Secretary of State and the Comptroller of Public
    Accounts of the State of Texas as to the continued existence and good
    standing of the Borrower.

         (g) An opinion of counsel to the Borrower acceptable to the Bank as
    to:

             (i)   the valid existence and good standing of the Borrower under 
                   the laws of the State of Texas.

    Amended and Restated Credit Agreement                         Page 8


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             (ii)   the due authorization, execution and delivery by the
                    Borrower of this Restated Agreement, the Note and the
                    Security Documents to which it is a party.

             (iii)  this Restated Agreement, the Note and the Security 
                    Documents to which the Borrower is a party constituting
                    the legally valid and binding obligations of the
                    Borrower in accordance with their terms.

             (iv)   the execution, delivery and performance of this Restated
                    Agreement, the Note and the Security Documents to which
                    the Borrower is a party, by the Borrower not resulting
                    in a breach of any terms or conditions of, or resulting
                    in the imposition of any lien, charge or encumbrance
                    upon any properties of the Borrower or constituting a
                    default under any indenture, agreement, order, judgment
                    or other instrument under which the Borrower or its
                    property may be bound or constituting a violation of
                    the Articles of Incorporation or By-Laws of the
                    Borrower or violating any provision of applicable law.

             (v)    the execution, delivery and performance of this 
                    Agreement, the Note and the Security Documents to which
                    the Borrower is a party by the Borrower not requiring
                    the consent or approval of, the giving of notice to,
                    the registration with or the taking of any action by
                    any governmental authority of the United States or the
                    State of Texas.

             (vi)   such other matters as the Bank may request.

         (h) the Note.

         (i) Uniform Commercial Code financing statements covering the 
    security interests granted by the Security Documents shall have been duly
    executed by the Borrower as debtor, and duly filed in all places as are, in
    the opinion of the Bank, necessary or desirable to perfect said security
    interest.

         (j) Evidence of the insurance required by Section 9(b)(vii) hereof.

         (k) Evidence satisfactory to the Bank that the Borrower's indebtedness
    to Saudi Fal is repaid in full within two business days following the
    Closing Date.

         (l) Evidence satisfactory to the Bank that the Borrower's indebtedness
    to American Shield Refining Company and Arabian Shield

    Amended and Restated Credit Agreement                         Page 9
   

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    Development Company has been converted to a contribution of capital to the
    Borrower.

         3.4 The obligations of the Bank to make each subsequent Advance shall
    be subject to the further condition precedent that the Bank shall have
    received a certificate dated the date of such Advance of the Borrower
    certifying that:

    (a)  the representations and warranties contained in Section 9 are true
         and correct on and as of the date of such Advance as though made
         on and as of such date; and

    (b)  no event has occurred and is continuing, or would result from such
         Advance, which constitutes an Event of Default or with the passing
         of time or the giving of notice would constitute an Event of Default.

         3.5 All of the conditions precedent contained in this Section 3 are
    for the sole benefit of the Bank and the Bank may waive any of them in its
    absolute discretion.

    4.   EXTENSION RENEWAL AND AVAILABILITY

         Subject to the provisions of Sections 10 and 11 hereof and:

         (a) The Bank's prior satisfaction that the relevant conditions set out
             in Section 3 above have been complied with,

         (b) No Event of Default as defined in Section 15 herein has occurred 
             or is continuing,

    the indebtedness evidenced by the Old Note shall be refinanced, extended,
    renewed and restructured and the new credit facility of Facility B shall be
    made available to the Borrower all in accordance with the terms and
    provisions of this Restated Agreement.

    5.   INTEREST

         (a) Interest Rate

    The Borrower shall pay interest on the Advances drawn and outstanding under
    this Restated Agreement at the annual rate which is conclusively certified
    by the Bank to be the aggregate of the Margin and the Prime Rate.



    Amended and Restated Credit Agreement                        Page 10




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         (b) Interest Payment

             (i)   Interest shall be payable monthly in arrears on the last day 
                   of each month and on the Maturity Date and calculated in
                   accordance with Section 14 hereof.

             (ii)  If any interest would be payable on a non-Banking Day, it 
                   shall be paid on the next succeeding Banking Day.

         (c) Computation of Interest

         Notwithstanding any provision of this Restated Agreement or the Note
    to the contrary, in no event shall the aggregate amount of consideration
    which constitutes interest under any applicable law which is contracted
    for, charged or received hereunder or under the Note ("Interest") exceed
    the maximum amount of nonusurious interest allowed by law, and any excess
    shall be credited on this Restated Agreement or the Note (or if all
    obligations under this Restated Agreement or the Note shall have been paid
    in full, refunded to the Borrower). For purposes of the foregoing, the
    maximum amount of interest allowed by law shall be calculated by
    determining the amount of interest that could be contracted for, charged or
    received during the term hereof at the maximum rate of nonusurious interest
    allowed from time to time by applicable law as is now or, to the extent
    allowed by law, as may hereafter be in effect (the "maximum nonusurious
    interest rate") and, if at any time the rate of Interest to accrue would
    exceed the maximum nonusurious interest rate, the rate of Interest to
    accrue under this Restated Agreement or the Note shall be limited to the
    maximum nonusurious interest rate, but any subsequent reductions in the
    Prime Rate shall not reduce the rate of Interest to accrue under this
    Restated Agreement or the Note below the maximum nonusurious interest rate
    until the total amount of Interest accrued and paid under this Restated
    Agreement or the Note equals the amount of Interest which would have
    accrued if a rate per annum equal to the Prime Rate plus the Margin had at
    all times been in effect.

    6.   REPAYMENT

         The Borrower shall repay all principal amounts outstanding plus any
    other outstanding amounts hereunder in a single installment on the Maturity
    Date. Subject to the terms hereof, the Borrower may reborrow amounts repaid
    or prepaid prior to the Maturity Date, upon one (1) day prior written
    notice to the Bank.

    Amended and Restated Credit Agreement                        Page 11

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    7.   PREPAYMENT

         The Borrower shall make an immediate prepayment in an amount by
    which the principal amount outstanding hereunder exceeds the Commitment or
    the Borrowing Base, if ever.

    8.   SECURITY

         The Facility is secured by:

         (a) The Pledge Agreement dated June 16, 1997 by DCCO II in favor of
    the Bank.

         (b) The Deed of Trust dated January 20, 1985 from the Borrower to
    Michael E. Niebruegge as Trustee.

         (c) The Deed of Trust dated April 8, 1986 from Texas Oil &
    Chemical Terminal, Inc. ("Terminal") to Michael E. Niebruegge as
    Trustee.

         (d) The Security Agreement and Financing Statement from the Borrower
    to the Bank dated as of January 14, 1985, duly ratified by the Borrower.

         (e)  The Cash Collateral Accounts.

         (f) An Assignment of Insurances dated March 3, 1988 from the Borrower
    and Texas Oil & Chemical Co. II, Inc., duly ratified by the parties
    thereto.

         (g) A pledge by American Shield Refining Company of all of the issued
    and outstanding shares of Texas Oil & Chemical Co. II, Inc. in form and
    substance satisfactory to the Bank, duly ratified by the parties thereto.

    9.   REPRESENTATIONS AND COVENANTS

         (a)  The Borrower represents to and agrees with the Bank that:

         (i)  this Restated Agreement and the Security Documents to which it is
              a party constitute valid, binding and enforceable obligations of
              the Borrower according to the terms and conditions hereof and
              thereof and the execution and performance of this Restated
              Agreement and such Security Documents do not and will not
              contravene any applicable law, order, regulation or restriction
              of any kind binding on the Borrower.

    Amended and Restated Credit Agreement                        Page 12


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         (ii) the Borrower is a duly formed and validly existing corporation
              under the laws of the State of Texas, has full power to enter
              into this Restated Agreement and the Security Documents to which
              it is party, to make borrowings hereunder and to service and
              repay the Commitment.

        (iii) the chief executive office of the Borrower is located at 7752 FM 
              418, Silsbee, Texas.

         (iv) it is currently in possession of permits authorizing all 
              activities now or formerly conducted on the properties securing
              this indebtedness from the Texas Water Commission, the Texas Air
              Quality Control Board, the U.S. Environmental Protection Agency,
              the U.S. Army Corps of Engineers and the Texas Railroad
              Commission. Furthermore, the Borrower agrees that it maintains no
              Hazardous Substances on the properties securing this indebtedness
              without possession of the appropriate permits.

         (v)  no Event of Default has occurred and is continuing.

         (b)  Affirmative Covenants. The Borrower undertakes to the Bank that
    so long as any amount is owing hereunder it will:

         (i)  promptly inform the Bank of any occurrence of which it becomes 
              aware which is, or with the passage of time or the giving of
              notice would constitute, an Event of Default hereunder or under
              any of the Security Documents to which it is a party or which in
              its reasonable opinion might adversely affect its ability fully to
              perform its obligations under this Restated Agreement or any of
              the Security Documents to which it is a party.

         (ii) deliver to the Bank by the 105th day of the end of the each fiscal
              year, consolidated annual audited financial statements, including
              consolidating financial statements of the Borrower, and by the
              30th day after the end of each month, profit and loss and balance
              sheet statements.

        (iii) deliver to the Bank by the 30th day following the end of each 
              quarter, statements showing the source and use of funds of the
              Borrower for the preceding quarter.

         (iv) deliver to the Bank within 3 Banking Days of the last day of each
              calendar month and the 15th day of each calendar month a
              Borrowing Base Certificate as of such days as well as a
              certificate signed by the President or the Chief Financial
              Officer of the Company as to the inventory and accounts
              receivable (status and aging) of the Borrower.



    Amended and Restated Credit Agreement                        Page 13


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         (v)  deliver to the Bank within 45 days of the last day of each fiscal 
              quarter, compliance statements signed by the President or Chief
              Financial Officer of the Borrower certifying that the Borrower is
              in compliance with all of the representations and covenants
              hereof as if made on the date of such certificate, and that no
              default has occurred hereunder, together with a calculation of
              all financial ratios set forth in Section 9(c)(ix), (x) and (xi)
              hereof.

        (vi)  deliver to the Bank no later than December 1 of each year the 
              business plan, income and expense projections, projected balance
              sheet and projected sources and uses of funds statement of the
              Borrower for the subsequent calendar year.

       (vii)  deliver to the Bank within 45 days of the end of each calendar 
              month a written status report of the Borrower's operations,
              financial performance and outstanding accounts payable for the
              previous calendar month and such other financial information as
              the Bank may from time to time reasonably request; permit the
              Bank or its representative at any reasonable time or times to
              inspect the properties of the Borrower and to inspect, audit and
              examine the books or records of the Borrower and to take extracts
              therefrom. The Bank shall further have the right to order an
              audit of Borrower's books and records, no more than twice
              annually. The costs of such audit shall be borne by the Borrower.

      (viii)  maintain insurance acceptable to the Bank including, but not
              limited to, casualty insurance with responsible and reputable
              insurance companies or associations in such amounts and covering
              such risks as is usually carried by companies engaged in similar
              businesses and owning similar properties in the same general
              areas in which the Borrower operates. The Borrower shall furnish
              the Bank with evidence of all such insurance policies currently
              in force and with evidence of payment of the premiums on such
              policies.

        (ix)  execute and deliver to the Bank any instruments, documents or
              certificates which in the Bank's judgment are necessary to amend,
              modify, extend or supplement any of the Security Documents to
              better evidence, reflect and secure the Note.

    Amended and Restated Credit Agreement                        Page 14

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         (x)  perform and maintain, or cause to be performed or maintained, all 
              permits, licenses, consents and agreements concerning its
              assets or operations.

        (xi)  notify the Bank, within five (5) days, should it ever come into 
              possession of knowledge or have a claim or complaint asserted
              against it because the Borrower or any other person or entity
              caused or permitted any Hazardous Substances to be stored,
              located, held or disposed of on, under or at any of the
              properties securing Facility A or Facility B in a manner not in
              compliance with all applicable laws, regulations and permits
              regarding such storage, holding or disposal. 

       (xii)  give the Bank, within five (5) days, written notice in the event 
              the Borrower receives notice of (1) the happening of any spill or
              cleanup of Hazardous Substances affecting the properties securing
              the Credit Facility, or any other property owned by the Borrower
              that would require the Borrower to notify any environmental
              agency, of any federal, state or local government of such spill
              or cleanup; or (2) any complaint, violation, notice or citation
              regarding any permit controlling the environmental health or
              safety violation of the Borrower, including health or safety
              violation of the Borrower, including without limitation, any
              notice from the Environmental Protection Agency.

      (xiii)  indemnify and hold the Bank harmless from and against any and all
              claims, losses, liability, damages and injuries of any kind
              whatsoever incurred or suffered by or asserted against the Bank
              with respect to or as a direct result of the presence, escape,
              seepage, spillage, leaking, discharge or migration from any of
              the properties securing the Credit Facility of any Hazardous
              Substance, including without limitation, any claims asserted or
              arising under CERCLA, RCRA or the Texas Solid Waste Disposal Act,
              regardless of whether or not caused by or within the control of
              the Borrower.

       (xiv)  cause each agreement between the Borrower and the holder of any 
              debt subordinated to the Loan to provide that such holder may not
              accelerate the payment of such subordinated debt until all
              amounts outstanding hereunder, now or in the future, are repaid
              or prepaid in full. 

         (xv) maintain its Inventory and other properties in good and safe 
              working order. The Bank shall have the right to perform an
              inspection of Borrower's Inventory and 



    Amended and Restated Credit Agreement                        Page 15

   18


              properties four (4) times per year upon at least two (2) days'
              prior notice to the Borrower. The costs of such inspections shall
              be borne by the Borrower.

        (xvi) Year 2000 Compliance. On or prior to June 30, 1999 (the
              "Compliance Date"), the Borrower shall take all actions necessary
              to insure that the automated systems used by the Borrower that are
              material to its operations (collectively, "Mission-Critical
              Systems"), including without limitation, software, hardware and
              other data processing devices, shall not fail, malfunction or
              produce incorrect results with respect to data, calculations and
              other processing involving dates before, as of or after December
              31, 1999, regardless of the form of the date data is received or
              processed (collectively "Year 2000 Compliant" or "Year 2000
              Compliance"). Without limiting the generality of the foregoing,
              on or prior to the Compliance Date, the Borrower shall test and
              certify that its Mission-Critical Systems are Year 2000 Compliant
              in accordance with commercially reasonable practices and industry
              standards. The Borrower agrees that upon the reasonable request of
              the Bank, the Borrower will make its employees, consultants,
              premises, records and documentation available to the Bank with
              respect to their Year 2000 Compliance efforts.

         (c)  Negative Covenants. The Borrower undertakes to the Bank that so
    long as any amount is owing hereunder it will not without the prior written
    consent of the Bank:

         (i)  create or permit to subsist, without the prior written consent of
              the Bank, any mortgage, pledge, lien or other security interest
              on any or all of its present or future revenues, properties or
              assets except liens in favor of Saudi Fal and Arabian Shield duly
              subordinated to any liens in favor of the Bank and liens
              permitted by the Security Documents or with the prior written
              consent of the Bank or as disclosed to the Bank in writing and
              accepted by the Bank on the Closing Date;

         (ii) borrow any money, enter into any lease or other financial 
              obligation or enter into any guarantee for the obligations or the
              indebtedness of any third party without the prior written consent
              of the Bank except (1) loans or leases entered into in connection
              with the acquisition of equipment in the ordinary course of
              business, which loans or leases shall not exceed $100,000 in the
              aggregate at any time and (2) one or more letters of credit
              naming

    Amended and Restated Credit Agreement                        Page 16

   19








              Southern Company Energy as beneficiary, the aggregate face amount
              of which shall not exceed USD 110,000;

        (iii) merge with any other entity or change its present line of 
              business. For the purposes of this Restated Agreement, the
              Borrower's line of business shall be the owning, acquisition,
              production, refining, transportation and sale of hydrocarbon
              products;

         (iv) make any investments or lend money to any party without the prior
              written consent of the Bank except for short-term employee loans
              not exceeding $40,000 in the aggregate;

          (v) except for Permitted Distributions, make any payment of interest 
              on or principal of any debt subordinated to the Loan or any
              dividend payments or distributions to its shareholders without
              the prior written consent of the Bank;

         (vi) make capital expenditures in any fiscal year of more than $350,000
              plus expenditures specifically submitted to and approved in
              writing by the Bank; 

        (vii) make any change in the address of its chief executive office 
              without the prior written consent of the Bank, which consent
              shall not be unreasonably withheld;

       (viii) sell or assign the accounts, contract rights or receivables
              pertaining to its business or sell, lease, abandon or otherwise
              dispose of, directly or indirectly, its assets except in ordinary
              course of business not to exceed USD 100,000 and except for the
              sale of three (3) hydrocracker reactors that are currently not
              in use;

         (ix) allow its Current Ratio to be less than 2.25:1.0;

          (x) allow its Tangible Net Worth to be less than the aggregate of (a)
              USD 5,200,000, including without limitation the amount of
              indebtedness (plus accrued and unpaid interest, if any) of
              Borrower to Arabian Shield and American Shield that is converted
              to equity of the Borrower, (b) 70% of positive Net Income after
              September 30, 1998 and (c) 100% of the proceeds of any equity
              offering by Borrower or capital contribution to Borrower.
              

         (xi) allow its earnings before Taxes to be less than USD 175,000 in any
              single quarter or less than USD 800,000 for any consecutive
              four-quarter period.

    Amended and Restated Credit Agreement                        Page 17

   20








          (d) Distributions. For purposes of Section 9(c) hereof, "Permitted 
    Distribution" shall mean:

          (i) A Distribution equal to the lesser of (A) thirty-five percent 
              (35%) of the quantity of (x) Borrower's Net Income before Taxes 
              for any quarter minus (y) one hundred fifty percent (150%) of the
              Required Commitment Reduction for such quarter, and (B) USD
              105,000; and

         (ii) A Distribution in the amount of no more than USD 45,000 per fiscal
              quarter; provided that such distribution shall not be a Permitted
              Distribution unless the Borrower's Net Income before Taxes for
              the previous fiscal quarter is USD 800,000 or greater.

        (iii) Any Distribution pursuant to subsections (i) or (ii) shall be made
              in the next succeeding quarter. The first Distribution pursuant
              to subsection (i) shall be made no earlier than the fourth
              quarter of 1998. The first Distribution pursuant to subsection
              (ii) shall be made no earlier than the first quarter of 1999. No
              Distribution shall be allowed if an Event of Default has occurred
              hereunder, the Note or any Security Document, or would be caused
              by such Distribution. The Borrower may not aggregate
              Distributions from more than one fiscal quarter; Distributions
              that accumulate in one fiscal quarter must be made in the next
              succeeding quarter only. The Borrower shall provide written
              notice to the Bank of any Distribution prior to its payment,
              together with a statement of Borrower's Net Income before Taxes
              for the applicable quarter, showing the calculations of the
              amount of such Distributions and certifying that no Event of
              Default has occurred or shall occur by reason of making the
              Distribution.

    10.  CHANGES IN CIRCUMSTANCES

         (a) In the event that any applicable law or regulation shall subject
    the Bank to any Taxes or impose any reserve deposit or other requirements
    against any assets or liabilities of the Bank, the result of which is to
    increase the cost to the Bank of making or maintaining the Credit Facility
    or to reduce the amount of principal or interest received by the Bank, then
    the Borrower shall be required to compensate the Bank for such additional
    cost or reduction.

         (b) In the event that any applicable law or regulation shall make it
    unlawful for the Bank to make or maintain the Credit Facility, then the
    Bank's obligations hereunder shall terminate,

    Amended and Restated Credit Agreement                        Page 18

   21








    and all amounts owing by the Borrower to the Bank shall become due
    and repayable forthwith.

         (c) If the circumstances contemplated by subclause (a) or (b) above
    should occur and the Bank intends to invoke the conditions contained
    therein, then the Bank shall promptly advise the Borrower thereof.

         (d) Should the conditions of subsection (a) above be invoked and the
    Borrower find the resultant additional cost to be unacceptable, then the
    Borrower shall prepay any amounts outstanding hereunder on the next Payment
    Date.

         (e) If the Borrower prepays any amounts outstanding hereunder in
    accordance with subsection (d) above, then it shall nonetheless compensate
    the Bank for additional costs defined under subsection (a) above up to and
    including the date of prepayment.

    11.  FEES, COSTS AND EXPENSES

         (a) The Borrower shall pay to the Bank upon demand, all reasonable
    costs, charges and expenses (including legal fees) incurred by the Bank in
    connection with the preparation, execution, amendment and enforcement of
    this Restated Agreement and the Security Documents and the preservation of
    the Bank's rights hereunder and thereunder.

         (b) The Borrower shall pay to the Bank on the Closing Date a
    facility fee of USD 10,000.

         (c) The Borrower shall pay a commitment fee to the Bank on the unused
    portion of the Credit Facility at the rate of 1/2 of 1% per annum on such
    unused portion, payable quarterly in arrears on the last day of each such
    quarter and commencing December 31, 1998.

         (d) The obligations of the Borrower under this Section 12 shall
    survive the repayment of all amounts outstanding hereunder and all interest
    due thereon.

    12.  PAYMENTS

         (a) All payments hereunder shall be made to the following account:

             Unibank New York
             For the account of Den norske Bank, New York Branch
             Account No. 28764999
             Ref. South Hampton Refining Company

    Amended and Restated Credit Agreement                        Page 19

   22








         (b) In the event of any payments hereunder not being received on the 
    due date therefor, interest will be charged by the Bank from the due date
    until the date that payment is received at a rate corresponding to the
    aggregate of the Margin plus 2% (two percent) and the Prime Rate as defined
    in Section 5(a)(i) hereof. Subject to the provisions of Section 5(c) hereof,
    interest charged under this subsection (b) shall be added to the defaulted
    amount on each Payment Date until the defaulted amount is repaid in full.

         (c) All payments to be made by the Borrower hereunder shall be made
    without set-off or counterclaim and free and clear or and without deduction
    for or on account of any present or future Taxes of any nature now or
    hereafter imposed unless the Borrower is compelled by law to make payment
    subject to any such Tax. In that event the Borrower shall pay to the Bank
    such additional amounts as may be necessary to insure that the Bank
    receives a net amount which the Bank would have received had payment not
    been made subject to such Tax.

         (d) If the Credit Facility or any part thereof is, for any reason
    whatsoever, prepaid or repaid on a day other than a Payment Date, the
    Borrower shall pay to the Bank on request such amount or amounts as may be
    necessary to compensate the Bank for any loss or premium or penalty
    incurred by it in respect of the liquidation or reemployment of funds
    borrowed for the purpose of maintaining such Facility.

    13.  CALCULATION

         All interest, commission and any other payments hereunder of an annual
    nature shall accrue from day to day and be calculated on the actual number
    of days elapsed and on the basis of a 365 or 366 day year, as appropriate.

    14.  EVENTS OF DEFAULT

         Upon notice from the Bank to the Borrower, the obligations of the Bank
    hereunder shall terminate forthwith and any amounts outstanding under this
    Restated Agreement and the Note (including interest accrued thereon) shall
    become immediately repayable (together with any compensatory amounts
    necessary) if any of the following events of default ("Events of Default")
    has occurred under this Restated Agreement:

           (a)  If the Borrower fails to pay any sum due hereunder on the due 
    date.

           (b)  If the Borrower defaults in the due performance and observance 
    of any of the terms, covenants, undertakings and

    Amended and Restated Credit Agreement                        Page 20
    
   23








    conditions on its part contained herein or in the Security Documents and
    such default continues unremedied for a period of 10 days.

         (c) If any representation made by the Borrower in this Restated
    Agreement or any notice, certificate, or statement delivered or made
    pursuant hereto or under the Security Documents proves to be incorrect,
    inaccurate or misleading in any material manner when made.

         (d) If a default is declared under any of the Security Documents.

         (e) If a distress or other execution is levied upon, or against any
    substantial part of the property of the Borrower and is not discharged
    within 15 days.

         (f) If the Borrower is unable to or admits in writing its inability to
    pay their debts as they mature, or makes a general assignment for the
    benefit of its creditors.

         (g) If any proceedings are commenced in, or any order or judgment is
    given by, any competent court for the liquidation, winding up or
    reorganization of the Borrower or any order shall be made by any competent
    court or resolution passed by the Borrower for the appointment of a
    receiver or a similar functionary for all or a substantial part of its
    assets, save for the purpose of amalgamation, reorganization or merger not
    involving insolvency the terms of which shall have received the prior
    written approval or the Bank, and as otherwise permitted herein.

         (h) If the Borrower ceases or threatens to cease to carry on its
    business or disposes or threatens to dispose of a substantial part of its 
    business, properties, or assets or the same are seized or appropriated for
    any reason and not released within 30 days.

         (i) If any license, consent, permission or approval required in
    connection with this Restated Agreement or any Security Document is
    revoked, terminated or modified in a manner which would materially restrict
    or limit the operation of any property owned or operated by the Borrower.

         (j) Default by the Borrower under any other agreement or indenture for
    the borrowing of money or the guarantee of a third party's obligations.

         Provided, however, that notwithstanding anything to the contrary in
    this Restated Agreement, in the event the Borrower has cured any Event of
    Default prior to the Bank having given notice of

    Amended and Restated Credit Agreement                        Page 21




   24








    acceleration of the amounts owed under this Restated Agreement with
    respect to such Event of Default, then such Event of Default shall be
    deemed not to have occurred and the Bank shall not be entitled to
    accelerate the Borrower's payment obligations hereunder.

    Amended and Restated Credit Agreement                        Page 22




   25








    15. CHANGE OF CONTROL. If at any time while the Note shall be outstanding
    or the Bank has a Commitment hereunder Nicholas N. Carter shall cease to be
    the president or chief executive officer of the Borrower, a "Change of
    Control" shall be deemed to have occurred. The Borrower shall promptly, but
    in any event within three (3) days give written notice to Bank upon
    obtaining knowledge of an event which is or would constitute the occurrence
    of a Change of Control. The Bank shall, upon the happening of a Change of
    Control, have the privilege, following the subsequent fifty (50) day
    period, of declaring the Note to be due and payable on a date not earlier
    than ten (10) days from the date of the exercise of said privilege. The
    Note then outstanding shall thereupon become due and payable on the date
    specified in the notice sent to the Borrower by the Bank including the
    principal amount thereof plus accrued interest thereon to the accelerated
    maturity date and any amounts owed by Borrower to the Bank pursuant to this
    Agreement or the Security Documents.

    16. NOTICES AND CORRESPONDENCE

         (a) Except as otherwise provided in this Section 16, all notices,
    requests, consents, demands and other communications provided for or
    permitted hereunder shall be effective when duly deposited in the mails,
    certified, return receipt requested, or delivered to Federal Express or
    similar courier company or transmitted by telex or telefax, addressed to
    the respective party at the address set forth below, except that notices to
    the Bank shall not be effective until received.

         Bank:       Den norske Bank ASA, Representative Office
                     333 Clay Street, Suite 4890
                     Houston, Texas 77002
                     Telefax No. (713) 757-1167
                     Attention: Byron Cooley

                     with a copy to

                     Den norske Bank ASA, New York Branch
                     200 Park Avenue, 31st Floor
                     New York, New York 10166-0396
                     Telefax No. (212) 681-4123
                     Attention: Customer Service

    Amended and Restated Credit Agreement                        Page 23

   26








         Borrower:  South Hampton Refining Company
                    7752 FM 418
                    P.O. Box 1636
                    Silsbee, Texas 77656
                    Telefax No.: (409) 385-2453
                    Attention: President

         (b) Either of the parties hereto may change its respective address by
    notice in writing given to the other party to this Restated Agreement.

         (c) All information required to be provided by the Borrower to the
    Bank pursuant to Section 9(b) above shall be sent to the Bank at the above
    Houston address.

         (d) Time is of the essence of this Restated Agreement but no failure
    or delay on the part of the Bank to exercise any power or right under this
    Restated Agreement shall operate as a waiver thereof or preclude the
    exercise of any other power or right. The remedies provided herein are
    cumulative, and are not exclusive of any remedies provided by law.

         (e) The Bank shall use its best efforts to deliver to Arabian Shield
    any notices which it is required to give to Borrower, but the Bank's
    failure to so provide shall not constitute lack of notice to the Borrower
    or the waiver of any default, nor shall same relieve the Borrower or any
    other party of liability hereunder.

    17. GOVERNING LAW AND JURISDICTION

         This Agreement shall be governed by, and construed in accordance with,
    the laws of the State of New York and the Borrower hereby irrevocable
    submits to the jurisdiction of the courts of the State of New York and the
    Federal courts located in New York.

    18.  FINAL AGREEMENT

         THIS WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL AGREEMENT BETWEEN THE
    PARTIES, COMPLETELY REPLACES CREDIT AGREEMENT REFERRED TO HEREIN, AND MAY
    NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
    ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN AGREEMENTS BETWEEN
    THE PARTIES.

    19.  COUNTERPARTS

         The Agreement shall be executed in any number of counterparts each of
    which, when so executed, shall be deemed an original, but all such
    counterparts shall constitute but one and the same instrument.


    Amended and Restated Credit Agreement                        Page 24

   27




         IN WITNESS whereof the parties hereto have caused this Agreement to be
    duly executed by their duly authorized representatives.

                                        SOUTH HAMPTON REFINING COMPANY

                                        By: /s/ NICK CARTER
                                           -----------------------------------
                                        Name:   Nick Carter
                                             ---------------------------------
                                        Title:  President
                                              --------------------------------

                                        DEN NORSKE BANK ASA

                                        By: /s/ BYRON L. COOLEY
                                           -----------------------------------
                                        Name:   Byron L. Cooley
                                             ---------------------------------
                                        Title:  Senior Vice President
                                              ---------------------------------

                                        BY: /s/ WILLIAM V. MOYER
                                           ------------------------------------
                                        Name:   William V. Moyer
                                             ----------------------------------
                                        Title:  Senior Vice President
                                              ---------------------------------


    Amended and Restated Credit Agreement                        Page 25

   28








                                                       ExHIBIT A TO AMENDED AND
                                                      RESTATED CREDIT AGREEMENT

                         SOUTH HAMPTON REFINING COMPANY

                                PROMISSORY NOTE

    USD 2,250,000.00                                       October _____, 1998 

    FOR VALUE RECEIVED, SOUTH HAMPTON REFINING COMPANY (herein called the
    "Undersigned") hereby promises to pay to Den norske Bank ASA, or order, on
    or before June 30, 2000 on demand, TWO MILLION TWO HUNDRED FIFTY THOUSAND
    AND NO/100 DOLLARS OF THE UNITED STATES OF AMERICA (USD 2,250,000.00) and
    to pay interest on the unpaid portion of said principal sum outstanding
    from time to time, as hereinafter provided.

                             Principal and Interest

    1.1 (a) Interest on this Note shall be payable at the times and the rates
    as provided in Section 5 of the Amended and Restated Credit Agreement (the
    "Restated Credit Agreement") dated the date hereof, between the Undersigned
    and the payee hereof.

         (b) In case any payment of principal or interest is not paid when due,
    additional interest at the rate determined as provided in Section 13(b) of
    the Restated Credit Agreement shall be payable on all overdue principal
    and, to the extent that the same may be lawful, on all overdue interest.

    1.2 Interest shall be calculated on the outstanding principal amounts and
    on the basis of the actual number of days and a year of 365 or 366 days, as
    appropriate.

    1.3 The principal of this Note shall be payable as provided in Section 6 of
    the Restated Credit Agreement.



   29








                                    SECURITY

    2.1 This Note is issued under and pursuant to the Restated Credit Agreement
    and is, in part, a renewal, restructure and rearrangement of the
    indebtedness evidenced by the promissory note dated March 3, 1988 from the
    Undersigned to the payee of this Note. Reference is hereby made to the
    Restated Credit Agreement for a description of the security of this Note,
    the nature and extent of the security afforded thereby and the rights of
    the Undersigned and the holder hereof with respect to such security.
    Payment of this Note may be demanded by the holder hereof prior to the
    maturity of this Note under certain circumstances and conditions, in the
    manner, and with the effect, provided in the Restated Credit Agreement and
    the Security Documents described therein.

                                 MISCELLANEOUS

    3.1 All parties hereto, including endorsers hereof, hereby waive
    presentment for payment, demand, protest and notice of protest and
    non-payment hereof and hereby consent that any and all securities or other
    property, if any, held by the holders hereof at any time as security for
    this Note may be exchanged, released or surrendered and that the time of
    payment of this Note may be extended, all in the sole discretion of the
    holder hereof and without notice and without affecting in any manner the
    liability of the parties hereto.

    3.2 No course of dealing between the Undersigned and the holder hereof in
    exercising any rights hereunder shall operate as a waiver of any right of
    any holders except to the extent expressly waived in writing by such
    holder.



   30








    3.3  Whenever any payment to be made hereunder shall be due on a Saturday,
    Sunday or public holiday under the laws of the place where payment is to
    be made pursuant to the Restated Credit Agreement or other day on which
    banking institutions at such place are not open for business, such payments
    shall be made on the next day on which such banking institutions are open
    for business after such holiday.

    3.4 Any notice to be given pursuant to this Note shall be given in
    accordance with Section 16 of the Restated Credit Agreement.

    IN WITNESS WHEREOF, the Undersigned has caused this Note to be duly
    executed the day and year first above written.

                                  SOUTH HAMPTON REFINING COMPANY

                                  By: /s/ NICK CARTER
                                     -----------------------------------------
                                       Name:  Nick Carter
                                            ----------------------------------
                                       Title: President
                                             ----------------------------------




   31








                                                       EXHIBIT B TO AMENDED AND
                                                      RESTATED CREDIT AGREEMENT

                           BORROWING BASE CERTIFICATE

    1.    Cash in Cash Collateral Accounts       USD
                                                    ---------------
          90%                                    USD
                                                    ---------------
    2.    Eligible Accounts Receivable*          USD
                                                    ---------------
          80%                                    USD
                                                    ---------------
    3.    Inventory (at market price)*
              Raw materials                      USD
                                                    ---------------
              Finished products                  USD
                                                    ---------------
          60%                                    USD
                                                    ---------------
    5.    Total 1, 2 and 3                       USD
                                                    ---------------
    6.    Outstanding to DnB                     USD
                                                    ---------------
    Certified as true and correct:


                                         SOUTH HAMPTON REFINING COMPANY

                                         By:
                                            ---------------------------------
                                         Title:
                                               ------------------------------


    Date: ______________, 199_



    * Detailed listing attached