THIRD AMENDMENT TO CREDIT AGREEMENT


    THIS THIRD AMENDMENT TO CREDIT AGREEMENT ("Third Amendment") effective as of
October 24, 1995 (the "Third Amendment Effective Date") is made and entered into
by  and  among  TESORO   PETROLEUM   CORPORATION  (the  "Company"),  a  Delaware
corporation, TEXAS COMMERCE BANK NATIONAL ASSOCIATION ("TCB"), individually,  as
an  Issuing  Bank  and  as  Agent  (the  "Agent")  and  BANQUE  PARIBAS  ("BP"),
individually,  and  as  an  Issuing Bank and as Co-Agent and the other financial
institutions (collectively, with  TCB  and  BP,  the  "Lenders")  parties to the
Credit Agreement (as hereinafter defined) as amended by this Third Amendment.


                                    RECITALS

         WHEREAS, the Company has entered into a Credit Agreement, dated  as  of
April  20, 1994, among the Company, TCB, individually, as an Issuing Bank and as
Agent, BP, individually, as  an  Issuing  Bank  and  as  Co-Agent, and the other
financial institutions parties thereto as amended  by  the  First  Amendment  to
Credit  Agreement  dated  effective  as  of  December  31,  1994  and the Second
Amendment and Supplement to Credit Agreement  dated effective as of September 1,
1995 (as amended, the "Credit Agreement");

    WHEREAS, the Company, the  Agent,  the  Co-Agent,  the  Guarantors  and  the
Lenders  have  agreed,  on  the  terms and conditions herein set forth, that the
Credit Agreement be amended in certain respects;

    NOW, THEREFORE, IT IS AGREED:

    Section 1.    Definitions.  Capitalized terms used but not otherwise defined
herein shall have the meaning assigned such terms in the Credit Agreement.

    Section 2.    Amendments to the Credit Agreement.  On and  after  the  Third
Amendment Effective Date, the Credit Agreement shall be amended as follows:

    (a)  The  following  new definitions are hereby added to Section 1.01 of the
         Credit Agreement:

              "Availability Adjustment  Amount"  shall  mean  $90,000,000 unless
         reduced or otherwise modified pursuant to Section 2.25.

              "PEDCO EBITDA" shall mean,  as  to  PEDCO,  and  for  any  Rolling
         Period,  the  amount  equal  to  net  income of PEDCO less any non-cash
         income included in such net  income,  plus, to the extent deducted from
         such  net  income,  interest  expense,  depreciation,   depletion   and
         impairment,  amortization  of leasehold and intangibles, other non-cash
         expenses, and taxes; provided, that, gains or losses on the disposition
         of assets shall not be included in PEDCO EBITDA.

              "Tesoro Refining and Marketing Group EBITDA" shall mean, as to the
         Tesoro Refining and Marketing  Group,  and  for any Rolling Period, the
         amount equal to consolidated net income  of  the  Tesoro  Refining  and
         Marketing Group less any

                                       1

         non-cash  income  included  in  such  net  income,  plus, to the extent
         deducted  from  such   net   income,  interest  expense,  depreciation,
         depletion and impairment, amortization of  leasehold  and  intangibles,
         other  non-cash expenses, and taxes; provided, that, gains or losses on
         the disposition of assets shall not  be included in Tesoro Refining and
         Marketing Group EBITDA.

    (b)  The definition of "Advance Notice" set forth in  Section  1.01  of  the
         Credit Agreement is hereby amended in its entirety to read as follows:

              "Advance  Notice"  shall  mean  written  or  telecopy  notice  (or
         telephonic  notice  promptly  confirmed in writing), which in each case
         shall be irrevocable, from the Company  to be received by the Agent, in
         the case of Base Rate Loans, before 10:00 a.m.  (Houston time)  or,  in
         the case of Eurodollar Loans, 11:00 a.m.  (Houston time), by the number
         of  Business Days in advance of any borrowing, conversion, continuation
         or prepayment of any  Loan  pursuant  to this Agreement as respectively
         indicated below:

                (i)     Eurodollar Loans  - 3 Business Days; and

               (ii)     Base Rate Loans  - same Business Day.

         For the purpose of determining the respectively applicable Loan in  the
         case  of  the  conversion  from one type of Loan into another, the Loan
         into which there is to be  a conversion shall control.  The Agent, each
         Issuing Bank and each Lender are entitled to rely  upon  and  act  upon
         telecopy  notice  made  or  purportedly  made  by  the Company, and the
         Company  hereby  waives  the  right  to  dispute  the  authenticity and
         validity of any such transaction once  the  Agent  or  any  Lender  has
         advanced funds or any Issuing Bank has issued Letters of Credit, absent
         manifest error.

    (c)  The  definition of "Maximum Available Amount" set forth in Section 1.01
         of the Credit Agreement is  hereby  amended  in its entirety to read as
         follows:

              "Maximum Available Amount" shall mean,  at  any  date,  an  amount
         equal  to  the lesser of (a) the aggregate Revolving Credit Commitments
         as of such date, (b) the  Borrowing  Base  as  of such date and (c) the
         Availability Adjustment Amount as of such date.

    (d)  The definition of "Tesoro Refining and Marketing Group"  set  forth  in
         Section  1.01 of the Credit Agreement is hereby amended in its entirety
         to read as follows:

              "Tesoro Refining and  Marketing  Group"  shall mean Tesoro Alaska,
         Tesoro R&M, Tesoro Alaska Pipeline  Company,  a  Delaware  corporation,
         Tesoro  Northstore  Company,  an  Alaska  corporation,  Interior  Fuels
         Company,  an  Alaska  corporation,  Kenai  Pipeline Company, a Delaware
         corporation, and Tesoro  Vostok  Company,  a Delaware corporation.

                                       2

    (e)  The following new Section 2.25 is hereby added to the Credit Agreement:

         Section 2.25.  Availability Adjustment Amount.

              (a) Mandatory Financial Test Reductions:  If either (i) the Tesoro
         Refining and Marketing Group fails to maintain the Tesoro Refining  and
         Marketing Group EBITDA in an amount equal to or greater than the amount
         set  forth  below  or  (ii)  the  Company fails to maintain a cash flow
         coverage ratio for itself and  its Subsidiaries on a consolidated basis
         equal to or greater than the ratio set forth below:

           For the Rolling     Minimum Tesoro Refining        Minimum Cash
           Period Ending      and Marketing Group EBITDA    Flow Coverage Ratio
           -------------      --------------------------    -------------------

           December 31, 1995        $10,600,000                1.45 to 1.00
           March 31, 1996           $17,700,000                1.67 to 1.00
           June 30, 1996            $23,900,000                1.69 to 1.00

         then the Availability Adjustment Amount shall be reduced no later  than
         45  days  following  each  applicable  Quarterly  Date  by an amount of
         $5,000,000; provided that the aggregate amount of such reductions shall
         not exceed $10,000,000 in the aggregate.

              (b)  Optional Increases:  If at any time on or after September 30,
         1996, (i) the sum  of  the  Tesoro  Refining and Marketing Group EBITDA
         plus the PEDCO EBITDA is greater than or equal to $35,000,000 and  (ii)
         the  Company  is  maintaining a cash flow coverage ratio for itself and
         its Subsidiaries on a consolidated basis  equal to or greater than 1.37
         to 1.00, then the Company may, to the extent (but only to  the  extent)
         the  Availability Adjustment Amount shall have been reduced pursuant to
         Subsection 2.25(a), increase the Availability Adjustment Amount.

              (c)  Mandatory Reductions Based  on  E&P  Loan  Value:  During any
         period when the E&P Loan Value is less than  $30,000,000,  the  Maximum
         Available  Amount shall be reduced by an amount equal to the difference
         between $30,000,000 and the then current E&P Loan Value.

    (f)  Section 5.03(d)  of  the  Credit  Agreement  is  hereby  amended in its
         entirety as follows:

              (d)  Tesoro Refining and Marketing Group EBITDA.  Cause the Tesoro
         Refining and Marketing  Group  to  maintain  the  Tesoro  Refining  and
         Marketing Group EBITDA in an amount equal to or greater than:

                                       3

              For the Rolling               Minimum Tesoro Refining
              Period Ending                 and Marketing Group EBITDA
              -------------                 --------------------------

              September 30, 1995            $5,000,000
              December 31, 1995             $5,000,000
              March 31, 1996                $12,000,000
              June 30, 1996                 $20,000,000
              September 30, 1996            $20,000,000
              December 31, 1996             $25,000,000
              March 31, 1997
                and thereafter              $30,000,000

    (g)  Section  5.04(e)  of the Credit Agreement is hereby amended by deleting
         the reference to "and" at the end of clause (x), by changing the period
         at the end of clause (xi) to  read  "; and" and by adding the following
         new clause (xii):

              (xii)  the purchase of up to 100% of the shares of common stock of
         Coastwide  Energy  Services,  Inc.,   a   Delaware   corporation,   for
         consideration  (including, without limitation, equity securities of the
         Company and  cash)  in  an  amount  not  to  exceed  $24,000,000 in the
         aggregate.

    (h)  Section 5.04(p) of the  Credit  Agreement  is  hereby  amended  in  its
         entirety as follows:

              (p)  Proceeds  of  Coastal  Sale.   Permit  the  Company  and  its
         Subsidiaries to use the proceeds received by Tesoro LP from the sale of
         Oil  &  Gas  Properties  pursuant  to  the  Coastal  Purchase  and Sale
         Agreement for repayment of  debt  incurred pursuant to the Subordinated
         Debentures or in any other manner except (i) to redeem a portion of the
         Subordinated Debentures in an aggregate principal amount not to  exceed
         $34,700,000.00  plus  interest  accrued  through the redemption date of
         such Subordinated Debentures, (ii) $12,000,000 in the aggregate of such
         proceeds may be used to  purchase  up  to  100% of the shares of common
         stock of Coastwide Energy Services, Inc., a  Delaware  corporation,  or
         (iii)  for  general  corporate purposes other than the repayment of the
         Subordinated Debentures.

    (i)  Annex I to the Credit  Agreement  is  hereby amended to be identical to
         Exhibit A attached hereto, which Annex sets  forth  the  Commitment  of
         each Lender as of the Third Amendment Effective Date.

    (j)  Exhibit  C to the Credit Agreement is hereby amended to be identical to
         Exhibit B attached hereto,  which  sets  forth  the Subsidiaries of the
         Company.

    Section  3.    Amendment  Fee. As a condition precedent to the effectiveness
of this Third Amendment, the Company shall  pay on or before the Third Amendment
Effective Date to the Agent for the account of and distribution to  each  Lender
in accordance with its Percentage Share an amendment fee of $156,250 computed at
a  rate  equal  to  one-eighth  of  one percent (1/8%) per annum on the original
Commitments.

    Section 4.    Limitations.   The  amendments  set  forth  herein are limited
precisely as written and shall not be deemed to (a) be a consent to,  or  waiver
or  modification  of, any other term or condition of the Credit Agreement or any
of the other Financing Documents, or (b) except as

                                       4

expressly set forth herein, prejudice any  right or rights which the Lenders may
now have or may have in the future  under  or  in  connection  with  the  Credit
Agreement,  the  Financing  Documents  or any of the other documents referred to
therein.  Except as expressly modified  hereby  or by express written amendments
thereof, the terms and provisions of the Credit Agreement, the  Notes,  and  any
other  Financing  Documents  or  any  other documents or instruments executed in
connection with any of the  foregoing  are  and  shall  remain in full force and
effect.  In the event of a conflict between this Third Amendment and any of  the
foregoing documents, the terms of this Third Amendment shall be controlling.

    Section  5.    Representations  and  Warranties.   Except as affected by the
transactions contemplated in the Credit Agreement and this Third Amendment, each
of the representations and warranties made  by the Company and the Guarantors in
or pursuant to the Financing Documents, including the Credit Agreement, shall be
true and correct in all material respects as of the  Third  Amendment  Effective
Date, as if made on and as of such date.

    Section  6.    No  Default.   No  Default  or  Event  of  Default shall have
occurred and be continuing as of the Third Amendment Effective Date.

    Section 7.    Adoption, Ratification  and  Confirmation of Credit Agreement.
Each of the Company, the Guarantors, the Agent, the Co-Agent, the Issuing  Banks
and  the  Lenders does hereby adopt, ratify and confirm the Credit Agreement, as
amended hereby,  and  acknowledges  and  agrees  that  the  Credit Agreement, as
amended hereby, is and remains in full force and effect.

    Section  8.    Ratification  and  Affirmation  of  Guaranty.   Each  of  the
Guarantors hereby expressly (i) acknowledges the terms of this Third  Amendment,
(ii)  ratifies and affirms its obligations under the Guaranty Agreement dated as
of April 20, 1994, in favor  of  the  Agent, the Co-Agent, the Issuing Banks and
the Lenders, as amended, supplemented or otherwise modified, (iii) acknowledges,
renews and extends its continued liability  under  the  Guaranty  Agreement  and
agrees  that  such Guaranty Agreement remains in full force and effect; and (iv)
guarantees to the Agent,  the  Co-Agent,  each  Issuing  Bank and each Lender to
promptly pay when due all amounts owing or to be owing by it under the  Guaranty
pursuant to the terms and conditions thereof.

    Section  9.    Payment  of Expenses.  The Company agrees, whether or not the
transactions hereby contemplated shall be consummated, to reimburse and save the
Agent harmless from and  against  liability  for  the  payment of all reasonable
substantiated out-of-pocket costs and expenses arising in  connection  with  the
preparation,   execution,   delivery,   amendment,   modification,   waiver  and
enforcement of, or the preservation  of  any  rights under this Third Amendment,
including, without limitation, the reasonable fees and expenses of any local  or
other  counsel  for  the  Agent,  and  all  stamp  taxes (including interest and
penalties, if any), recording taxes and  fees,  filing taxes and fees, and other
charges which may be payable in respect of, or in respect  of  any  modification
of,  the  Credit Agreement and the other Financing Documents.  The provisions of
this Section shall  survive  the  termination  of  the  Credit Agreement and the
repayment of the Loans.

    Section 10.    Governing Law.  This  Third  Amendment  and  the  rights  and
obligations  of  the  parties  hereunder and under the Credit Agreement shall be
construed in accordance with and be governed  by  the laws of the State of Texas
and the United States of America.

    Section 11.    Descriptive Headings, etc.  The descriptive headings  of  the
several  Sections  of this Third Amendment are inserted for convenience only and
shall not be  deemed  to  affect  the  meaning  or  construction  of  any of the
provisions hereof.

                                       5

    Section 12.    Entire Agreement.  This Third  Amendment  and  the  documents
referred  to  herein  represent  the  entire understanding of the parties hereto
regarding the subject matter hereof  and supersede all prior and contemporaneous
oral and written agreements of the parties hereto with respect  to  the  subject
matter  hereof,  including, without limitation, any commitment letters regarding
the transactions contemplated by this Third Amendment.

    Section 13.    Counterparts.  This Third  Amendment  may  be executed in any
number of counterparts and by different parties on separate counterparts and all
of such counterparts shall together constitute one and the same instrument.

    Section  14.    Amended  Definitions.   As  used  in  the  Credit  Agreement
(including all  Exhibits  thereto)  and  all  other  instruments  and  documents
executed  in  connection  therewith,  on  and  subsequent to the Third Amendment
Effective Date the term "Agreement"  shall  mean the Credit Agreement as amended
by this Third Amendment.

                NOTICE PURSUANT TO TEX. BUS. & COMM. CODE 26.02

    This Third Amendment and the other Financing Documents executed  by  any  of
the  parties before or substantially contemporaneously with the execution hereof
together constitute a written Loan  Agreement  and represent the Final Agreement
between  the  parties  and  may  not  be  contradicted  by  evidence  of  prior,
contemporaneous or subsequent oral agreements of  the  parties.   There  are  no
unwritten  oral  agreements  between  the  parties.

                                       6

    IN  WITNESS  WHEREOF, the parties hereto have caused this Third Amendment to
be duly executed and delivered  by  their respective duly authorized officers as
of the date first above written.


                                       TESORO PETROLEUM CORPORATION


                                       By: /s/ William T. Van Kleef
                                       Name: William T. Van Kleef
                                       Title: Vice President and Chief
                                                Financial Officer

                              [Signature Page - 1]


                                       TEXAS COMMERCE BANK
                                       NATIONAL ASSOCIATION
                                       Individually, as an Issuing Bank and
                                       as Agent



                                       By: /s/ P. Stan Burge
                                            P. Stan Burge
                                            Vice President

                              [Signature Page - 2]


                                       BANQUE PARIBAS
                                       Individually, as an Issuing Bank and
                                       as Co-Agent


                                       By: /s/ Brian Malone
                                          Name: Brian Malone
                                          Title: Vice Predident


                                       By: /s/ Barton D. Schouest
                                          Name: Barton D. Schouest
                                          Title: Group Vice President

                              [Signature Page - 3]


                                       BANK OF SCOTLAND


                                       By: /s/ Catherine M. Oniffrey
                                          Name: Catherine M. Oniffrey
                                          Title: Vice President

                              [Signature Page - 4]


                                       CHRISTIANIA BANK


                                       By: /s/ Justin F. McCarty, III
                                          Name: Justin F. McCarty, III
                                          Title: Vice President

                                       By: /s/ Carl-Petter Svendsen
                                          Name: Carl-Petter Svendsen
                                          Title: First Vice President

                              [Signature Page - 5]


                                       THE BANK OF NOVA SCOTIA


                                       By: /s/ F.C.H. Ashby
                                          Name: F.C.H. Ashby
                                          Title: Senior Manager Loan Operations

                              [Signature Page - 6]


                                       NBD BANK


                                       By: /s/ Russell H. Liebetrau, Jr.
                                          Name: Russell H. Liebetrau, Jr.
                                          Title: Vice President

                              [Signature Page - 7]


                                       BANK OF AMERICA ILLINOIS

                                       By:
                                         Name:
                                         Title:

                              [Signature Page - 8]


                                       FIRST UNION NATIONAL BANK OF NORTH
                                       CAROLINA


                                       By: /s/ Michael J. Kolosowsky
                                          Name: Michael J. Kolosowsky
                                          Title: Vice President

                              [Signature Page - 9]


                                       NATIONAL BANK OF CANADA


                                       By: /s/ Larry L. Sears
                                          Name: Larry L. Sears
                                          Title: Group Vice President


                                       By: /s/ Douglas G. Clark
                                          Name: Douglas G. Clark
                                          Title: Vice President

                              [Signature Page - 10]


                                       THE FROST NATIONAL BANK


                                       By: /s/ Phil Dudley
                                          Name: Phil Dudley
                                          Title: Vice President

                              [Signature Page - 11]

GUARANTORS:        TESORO ALASKA PETROLEUM COMPANY
                   TESORO EXPLORATION AND PRODUCTION COMPANY
                   TESORO PETROLEUM COMPANIES, INC.
                   DIGICOMP, INC.
                   TESORO TECHNOLOGY PARTNERS COMPANY
                   INTERIOR FUELS COMPANY
                   TESORO ALASKA PIPELINE COMPANY
                   TESORO NORTHSTORE COMPANY
                   TESORO REFINING, MARKETING & SUPPLY COMPANY
                   TESORO NATURAL GAS COMPANY
                   TESORO BOLIVIA PETROLEUM COMPANY
                   TESORO PETROLEUM DISTRIBUTING COMPANY
                   TESORO LOUISIANA DISTRIBUTING COMPANY
                   TESORO ENVIRONMENTAL RESOURCES COMPANY


                   By: /s/ William T. Van Kleef
                         Name: William T. Van Kleef
                         Title: Vice President and Chief Financial Officer


                   TESORO E&P COMPANY, L.P.

                      By:  TESORO EXPLORATION AND PRODUCTION COMPANY, as
                           its general partner


                           By: /s/ William T. Van Kleef
                                Name: William T. Van Kleef
                                Title: Vice President and Chief Financial
                                         Officer

                   TESORO GAS RESOURCES COMPANY, INC


                   By: /s/ George L. Dodgen
                         Name: George L. Dodgen
                         Title: President

                              [Signature Page - 12]

                          EXHIBIT A TO THIRD AMENDMENT


                                    ANNEX I



                                  Commitments

                            Revolving
                            Credit         Unavailable        Total        Term Loan
Banks                       Commitments    Commitments     Commitments     Commitment<F1>
- -----                       -----------    -----------     -----------     --------------

                                                             
Texas Commerce Bank        $11,520,000.00  $     0.00   $11,520,000.00
Banque Paribas             $11,520,000.00        0.00   $11,520,000.00
Bank of Scotland            $9,360,000.00        0.00    $9,360,000.00
Christiania Bank            $9,360,000.00        0.00    $9,360,000.00
The Bank of Nova Scotia     $9,360,000.00        0.00    $9,360,000.00
NBD Bank                    $9,360,000.00        0.00    $9,360,000.00
Bank of America Illinois    $7,920,000.00        0.00    $7,920,000.00
First Union National
 Bank of North Carolina     $7,920,000.00        0.00    $7,920,000.00
National Bank of Canada     $7,920,000.00        0.00    $7,920,000.00
The Frost National Bank     $5,760,000.00  $     0.00    $5,760,000.00
                           --------------  ----------   --------------
  Total                    $90,000,000.00  $     0.00   $90,000,000.00

<FN>
<F1>  The Term Loan Commitments have expired.


                                  Annex I - 1

                          EXHIBIT B TO THIRD AMENDMENT

                                   EXHIBIT C


         SUBSIDIARIES                                      GUARANTORS
         ------------                                      ----------

         Tesoro Petroleum Companies, Inc.                  X
         Digicomp, Inc.                                    X
         Tesoro Technology Partners Company                X
         Tesoro Alaska Petroleum Company                   X
         Interior Fuels Company                            X
         Tesoro Alaska Pipeline Company                    X
         Tesoro Northstore Company                         X
         Tesoro Refining, Marketing & Supply Company       X
         Tesoro Exploration and Production Company         X
         Tesoro E&P Company, L.P.                          X
         Tesoro Gas Resources Company, Inc.                X
         Tesoro Natural Gas Company                        X
         Tesoro Bolivia Petroleum Company                  X
         Tesoro Petroleum Distributing Company             X
         Tesoro Louisiana Distributing Company             X
         Tesoro Environmental Resources Company            X
         Tesoro Environmental Products Company
         Sabinal Insurance Company Limited
         Tesoro Indonesia Petroleum Company
         Tesoro Tarakan Petroleum Company
         Tesoro Java Petroleum Company
         Tesoro Equipment Company
         Tesoro Drilling Company
         Tesoro Crude Oil Company
         Tesoro Fleet Service Company
         Tesoro Gasoline Marketing Company
         Tesoro Pump & Valve Company
         Kenai Pipeline Company
         Tesoro Vostok Company

                                     B - 1