SECURITY AGREEMENT

                                   (Accounts)



                                    Between

                             TESORO VOSTOK COMPANY

                                      and

                                BANQUE PARIBAS,
                            AS ADMINISTRATIVE AGENT



                                  June 7, 1996


                               SECURITY AGREEMENT

                                    Accounts

    THIS SECURITY AGREEMENT is made  as  of  June 7, 1996, between TESORO VOSTOK
COMPANY,  a  Delaware   corporation   ("Debtor"),   and   BANQUE   PARIBAS,   as
Administrative Agent ("Secured Party"), for the Issuing Banks and the Lenders.

                                    RECITALS

    A.   On  even  date  herewith, Tesoro Petroleum Corporation (the "Company"),
Secured Party, The Bank of  Nova  Scotia,  as  Documentation Agent and the other
financial institutions parties thereto (the  "Lenders")  are  entering  into  an
Amended and Restated Credit Agreement (as amended from time to time, the "Credit
Agreement").

    B.   The  conditions  precedent to the effectiveness of the Credit Agreement
include the execution and  delivery  by  Debtor  of this Security Agreement, and
Debtor has agreed to enter into this Security Agreement.

    C.   Therefore, (i) in order to comply with the terms and conditions of  the
Credit  Agreement,  (ii)  to induce the Lenders at any time from time to time to
loan monies and the Issuing Banks  to  issue  Letters of Credit, with or without
security to or for the account of the Company in accordance with  the  terms  of
the  Credit Agreement, (iii) at the special insistence and request of the Agent,
the Issuing  Banks  and  the  Lenders,  and  (iv)  for  other  good and valuable
consideration, the receipt and sufficiency of  which  are  hereby  acknowledged,
Debtor agrees with Secured Party as follows:


                                   ARTICLE I

                                  Definitions

    Section 1.01   Terms Defined Above.  As used in this Security Agreement, the
terms "Company," "Credit Agreement," "Debtor" and "Secured Party" shall have the
meanings respectively assigned to them.

    Section 1.02   Certain Definitions.  As used in this Security Agreement, the
following  terms shall have the following meanings, unless the context otherwise
requires:

         "Accounts" shall mean all  accounts  (as  such  term  is defined in the
    Code).

         "Account Debtor" shall mean any  Person  liable  (whether  directly  or
    indirectly,  primarily or secondarily) for the payment or performance of any
    obligations included in the  Collateral,  whether  as  an account debtor (as
    defined in the Code), obligor on  an  instrument,  issuer  of  documents  or
    securities, guarantor or otherwise.


         "Code" shall mean the Uniform Commercial Code as presently in effect in
    the State of Texas, Texas Business and Commerce Code, Chapters 1 through 9.

         "Collateral"  shall  mean  the  following  types  or  items of Property
    (including Property hereafter acquired by  Debtor  as well as Property which
    Debtor now owns or in which Debtor has rights):

         (a)  all of Debtor's Accounts;

         (b)  any Property from time to time  delivered  to  or  deposited  with
    Secured  Party  by  or  for  the  account  of Debtor which is related to any
    Property referred to in this definition;

         (c)  all proceeds, replacements, additions to and substitutions for any
    of the Property referred  to  in  this  definition  and claims against third
    parties;

         (d)  all books and records related to any of the Property  referred  to
    in  this  definition,  including,  without  limitation, any and all books of
    account, customer  lists  and  other  records  relating  in  any  way to the
    Collateral described in this definition;

         (e)  all of Debtor's general intangibles (as defined in the Code) which
    are related (but only those related) to any Property  referred  to  in  this
    definition, including, without limitation, all (i) letters of credit, bonds,
    guaranties,  purchase  or  sales  agreements  and  other contractual rights,
    rights to  performance,  and  claims  for  damages,  refunds  (including tax
    refunds) or other monies due or to  become  due;  (ii)  orders,  franchises,
    permits,    certificates,   licenses,   consents,   exemptions,   variances,
    authorizations or  other  approvals  by  any  Governmental  Authority; (iii)
    business records, computer tapes  and  computer  software;  and  (iv)  other
    intangible  personal property, whether similar or dissimilar to the Property
    referred to in clause (a) of this definition; and

         (f)  all of Debtor's chattel paper,  documents and instruments (as such
    terms are defined in the Code) related to or arising  out  of  any  Property
    referred to in this definition.

         It  is expressly contemplated that additional Property may from time to
    time be pledged, assigned or granted to Secured Party as additional security
    for the Obligations, and, if so,  then  the term "Collateral" as used herein
    shall be deemed for all purposes  hereof  to  include  all  such  additional
    Property,  together  with  all  other  Property of the types described above
    related thereto.  It is expressly  agreed  that Collateral shall not include
    and shall be exclusive of any equipment.

         "Event of Default" shall have the meaning assigned such term in Section
    6.01 of this Security Agreement.

                                      -2-

         "Obligations" shall mean with respect to the  Debtor,  the  Obligations
    (as  defined  in  the Guaranty Agreement) to the extent the Debtor is liable
    therefor as provided in the  Guaranty Agreement.  The Obligations are Senior
    Debt as such term is defined in that certain Subordination  Agreement  dated
    December 15, 1992 among the Company, Tesoro Alaska Petroleum Company and the
    State  of  Alaska  attached  to  the Settlement Agreement among the Company,
    Tesoro Alaska Petroleum Company and the State of Alaska.

         "Obligor" shall mean  the  Company  and  any  other  Person, other than
    Debtor, liable (whether directly or indirectly,  primarily  or  secondarily)
    for  the  payment or performance of any of the Obligations whether as maker,
    co-maker,  endorser,  guarantor,  accommodation  party,  general  partner or
    otherwise; and the term "Obligor" shall specifically include each Guarantor,
    other than Debtor, named in the Credit Agreement.

         "Property" shall mean any interest in any kind of  property  or  asset,
    whether real, personal or mixed, or tangible or intangible.

         "Security  Agreement"  shall  mean this Security Agreement, as the same
    may be amended, modified or supplemented from time to time.

         Section 1.03   Other Defined Terms.  Unless otherwise  defined  herein,
all  terms  beginning  with  a  capital  letter  which are defined in the Credit
Agreement shall have the  meanings  assigned  therein, unless the context hereof
requires otherwise.  All uncapitalized terms which are defined in the Code shall
have their respective meanings as used in the Code, unless  the  context  hereof
requires otherwise.


                                   ARTICLE II

                               Security Interest

    Section 2.01   Grant of Security Interest.  Debtor hereby assigns and grants
to Secured Party, for its benefit and the benefit of the Lenders and the Issuing
Banks,  a  security  interest  in,  lien  upon  and right of set-off against the
Collateral to secure the prompt payment and performance of the Obligations.


                                  ARTICLE III

                         Representations and Warranties

    Debtor represents and warrants to  Secured  Party, the Issuing Banks and the
Lenders (which representations and warranties  will  survive  the  creation  and
payment of the Obligations) that:

                                      -3-

    Section 3.01   First  Priority Security Interest.  The grant of the security
interest in the Collateral pursuant  to  this Security Agreement creates a valid
and perfected first priority security interest in  the  Collateral,  enforceable
against Debtor and all third parties and securing payment of the Obligations.

    Section 3.02   No Filings By Third Parties.  No financing statement or other
public  notice  or  recording  covering  the Collateral is on file in any public
office (other than any financing  statement  or other public notice or recording
naming Secured Party as the secured party therein), and Debtor will not  execute
any  such financing statement or other public notice or recording so long as any
of the Obligations are outstanding.

    Section 3.03   No Name Changes;  Federal  Tax Identification Number.  Debtor
has not, during the preceding five years, entered into any contract,  agreement,
security  instrument or other document using a name other than, or been known by
or otherwise used any name other than, the name used by Debtor herein.

    Section 3.04   Location of  Debtor.   Debtor's  chief  executive  office and
Debtor's records concerning  the  Collateral  are  located  at  the  address  or
location set forth on the signature page hereof.

    Section 3.05   Collateral.   All statements or other information provided by
Debtor to Secured Party, any  Issuing  Bank  or  any  Lender with respect to the
Collateral is or (in the case of subsequently  furnished  information)  will  be
when  provided  correct  and complete in all material respects.  The delivery at
any time by Debtor to  Secured  Party  of additional Collateral or of additional
descriptions of Collateral shall constitute a  representation  and  warranty  by
Debtor  to  Secured  Party  hereunder that the representations and warranties of
this Article III are correct insofar as they would pertain to such Collateral or
the descriptions thereof.

    Section 3.06   Accounts.

    (a)  Each  Account  represents  the  genuine,  valid and legally enforceable
indebtedness of an Account Debtor arising  from  the sale, lease or rendition by
Debtor of goods or services and is  not  and  will  not  be  subject  to  contra
accounts,  set-offs,  defenses,  counterclaims, allowances or adjustments (other
than discounts for  prompt  payment  shown  on  the  invoice),  or objections or
complaints by the Account Debtor concerning its liability on  the  Account;  and
any  goods, the sale of which gave rise to an Account, have not been returned or
rejected by the Account  Debtor  or  lost  or  damaged  prior  to receipt by the
Account Debtor.

    (b)  The amount shown as to each Account on Debtor's books is or will be the
true and undisputed amount owing and unpaid thereon.   Except  as  disclosed  in
writing  to  Secured  Party,  each  Account  arose  or  shall have arisen in the
ordinary course of Debtor's business; provided, however, that any Accounts which
arose or hereafter arise outside the  ordinary course of Debtor's business shall
nevertheless be included as part of the Collateral.  Debtor has no

                                      -4-

knowledge of any bankruptcy, insolvency or  other  action  affecting  creditors'
rights with respect to any Account Debtor.

    (c)  Except  as  disclosed  in  writing  to  Secured  Party, each invoice or
agreement evidencing the Accounts is or will be due and payable not more than 90
days from the date thereof; provided, however,  that any Accounts not so due and
payable shall nevertheless be included as part of the Collateral.

    Section 3.07   Delivery of Documents or Letters of Credit.  With respect  to
any  Accounts  or  other Collateral supported by letters of credit, each of such
letters of credit has been  delivered  to Secured Party (provided, however, that
all letters of credit referred to in  Section  1.02  shall  be  subject  to  the
security  interest created by this Security Agreement irrespective of whether or
not such delivery shall have been made).

    Section 3.08   Ownership  of  Collateral;  Encumbrances;  Valid  and Binding
Agreement.  Debtor is the legal and beneficial owner of the Collateral free  and
clear  of  any adverse claim, lien, security interest, option or other charge or
encumbrance except for the  security  interest  created  by this Agreement or as
permitted by the  Credit  Agreement,  and  Debtor  has  full  right,  power  and
authority  to  assign and grant a security interest in the Collateral to Secured
Party.  This Agreement  constitutes  a  legal,  valid  and binding obligation of
Debtor enforceable against Debtor in accordance with its terms.  The  execution,
delivery  and  performance  of  this Agreement will not violate the terms of any
contract, agreement, law,  regulation,  order,  injunction,  judgment, decree or
writ to which Debtor is subject and does not require the consent or approval  of
any other Person.

    Section 3.09   No  Required Consent.  No authorization, consent, approval or
other action by, and no notice to  or filing with, any governmental authority or
regulatory body (other than the filing of financing statements) is required  for
(i)  the  due  execution,  delivery and performance by Debtor of this Agreement,
(ii) the grant by Debtor  of  the  security  interest granted by this Agreement,
(iii) the perfection of such security interest or (iv) the exercise  by  Secured
Party of its rights and remedies under this Agreement.


                                   ARTICLE IV

                            Covenants and Agreements

    Debtor  covenants and agrees that so long as any part of the Obligations are
outstanding:

    Section 4.01   Change in Location of Collateral or Debtor.  Debtor will give
Secured Party 30 days' prior written notice of (i) the opening or closing of any
place of Debtor's business or (ii) any  change in the location of Debtor's chief
executive office or address.

    Section 4.02   Intentionally left blank.

                                      -5-

    Section 4.03   Delivery of Letters  of  Credit  and  Instruments;  Proceeds.
Debtor will deliver each letter of credit, if any, included in the Collateral to
Secured  Party,  in  each  case  forthwith upon receipt by or for the account of
Debtor.  If any Account becomes evidenced by a promissory note, trade acceptance
or any other instrument for the payment of money (other than checks or drafts in
payment of Accounts collected by Debtor in the ordinary course of business prior
to notification by Secured  Party  under  Section 5.04), Debtor will immediately
deliver such instrument to  Secured  Party  appropriately  endorsed  to  Secured
Party,  as  collateral  assignee  and,  regardless  of  the form of presentment,
demand, notice of dishonor, protest and  notice of protest with respect thereto,
Debtor will remain liable thereon until such instrument is paid in full.  Except
as permitted by Sections 4.03 and 4.09, Debtor will deliver to Secured Party all
proceeds from the sale or other disposition  of  the  Collateral  promptly  upon
receipt.   If  chattel paper, documents or instruments are received as proceeds,
which are required to be delivered  to  Secured Party, they will be, immediately
upon receipt, properly endorsed or assigned and delivered to  Secured  Party  as
Collateral.

    Section 4.04   Sale,  Disposition or Encumbrance of Collateral.  Except with
the prior written consent of the  Majority  Lenders,  Debtor will not in any way
encumber any of the Collateral (or permit or suffer any of the Collateral to  be
encumbered)  or  sell,  assign,  lend,  rent,  lease  or otherwise dispose of or
transfer any of the Collateral to or  in  favor of any Person other than Secured
Party.

    Section 4.05   Intentionally left blank.

    Section 4.06   Records and Information.

    (a)  Debtor shall keep accurate  and  complete  records  of  the  Collateral
(including  proceeds).   These  records  shall reflect all facts concerning each
Account.  Secured Party may at  any  time  have  access to, examine, audit, make
extracts from and inspect without hindrance or delay Debtor's records, files and
the Collateral.

    (b)  Debtor will promptly furnish such information as Secured Party may from
time to time reasonably request regarding (i) the business, affairs or financial
condition of Debtor or (ii) the Collateral or Secured Party's rights or remedies
with respect thereto.  Any balance sheets or financial statements  requested  by
Secured  Party  pursuant  to  this  Section  4.06(b)  shall conform to generally
accepted accounting principles.

    (c)  Debtor  recognizes  that   financing   statements   pertaining  to  the
Collateral will be filed with the offices of the Secretary of  State  of  Texas,
the   Alaska  Department  of  Natural  Resources,  the  Secretary  of  State  of
California, the Secretary of State of  Oregon and the Department of Licensing of
the State of Washington.  Debtor will immediately notify Secured  Party  of  any
condition  or  event  that  may change the proper location for the filing of any
financing statements or other  public  notice  or  recordings for the purpose of
perfecting  a  security  interest  in  the  Collateral.   Without  limiting  the
generality of the foregoing, Debtor will (i) immediately notify Secured Party of
any change to a jurisdiction other than as represented in

                                      -6-

Section 3.04 (A) in the location of Debtor's chief  executive  office  or  chief
place  of  business,  (B)  in  the location of the office where Debtor keeps its
records concerning the Accounts, or (C)  in  the "location" of Debtor within the
meaning of Section 9-103(c) of the Code; and (ii) notify Secured Party  30  days
prior  to  any  change  in Debtor's name, identity or corporate structure or Tax
Identification Number.  In  any  notice  furnished  pursuant  to this paragraph,
Debtor will expressly state  that  the  notice  is  required  by  this  Security
Agreement  and  contains  facts  that  will or may require additional filings of
financing statements or other notices  for  the purpose of continuing perfection
of Secured Party's security interest in the Collateral.   Debtor  will  promptly
provide  written  notice  to  Secured  Party of all information which in any way
relates to  or  affects  the  Collateral  generally,  Secured  Party's rights or
remedies with respect thereto, the filing of any financing  statement  or  other
public  notices  or  recordings,  or  the  delivery  and  possession of items of
Collateral for the purpose of perfecting a security interest in the Collateral.

    Section 4.07   Further  Assurances.   Upon  the  request  of  Secured Party,
Debtor shall (at Debtor's expense) execute and  deliver  all  such  assignments,
certificates,   financing   statements  or  other  documents  and  give  further
assurances and do all  other  acts  and  things  as Secured Party may reasonably
request to perfect Secured Party's interest in the  Collateral  or  to  protect,
enforce or otherwise effect Secured Party's rights and remedies hereunder.

    Section 4.08   Intentionally left blank.

    Section 4.09   Accounts.

    (a)  Prior  to  notification  by Secured Party under Section 6.02(i), Debtor
will collect the Accounts in the ordinary  course of its business and may retain
the proceeds of such collections (subject to Section 4.03).

    (b)  Debtor shall immediately notify Secured Party in writing in  the  event
that  any representation given in Article III with respect to any Account ceases
to be true and correct  in  all  material respects; such notice specifying other
representation(s) that cease to be true and correct and the action, if any, that
Debtor proposes to take with respect thereto.

    (c)  Debtor will not modify, extend or substitute any contract, the terms of
which shall at any time have given rise to an Account, except  in  the  ordinary
course  of  business or with the prior written consent of Secured Party.  Debtor
will not re-date any invoice or sale or make sales with an extended payment date
beyond that customary in the  industry,  and  in  no  event longer than 90 days.
Debtor shall not adjust, settle, discount or compromise  any  of  the  Accounts,
except  in the ordinary course of business, as permitted in the Credit Agreement
or with the prior written consent of Secured Party.

    (d)  Debtor will duly  perform  or  cause  to  be  performed all of Debtor's
obligations with respect to the Accounts and the underlying sales  of  goods  or
other transactions giving rise to the Accounts.

                                      -7-

    Section 4.10   Condition of Collateral.  Debtor will maintain all Collateral
in  good  condition  and  in  accordance  with industry standards and practices.
Debtor will not misuse,  abuse,  waste,  destroy  or endanger the Collateral nor
allow it to be used in any manner other than its intended use.  Debtor will  not
use any Collateral in violation of any Governmental Requirement, or suffer it to
be so used.

    Section 4.11   Collateral  Separate and Distinct.  Debtor shall at all times
keep the Collateral, including proceeds,  or  cause  it  to be kept (when in the
possession of warehousemen, bailees, agents, independent  contractors  or  other
third  parties),  separate  and distinct from other Property; provided, however,
proceeds of the Collateral may be  kept in various concentration accounts of the
Parent or the Guarantors.

    Section 4.12   Change in Debtor's Name or Corporate Structure.  Debtor  will
not  change  its  name,  identity  or  corporate  structure  (including, without
limitation, any  merger,  consolidation  or  sale  of  substantially  all of its
assets) without notifying Secured Party of such change in writing  at  least  30
days  prior  to  the effective date of such change.  Without the express written
consent of Secured Party, however, Debtor  will not engage in any other business
or transaction under any name other than Debtor's name hereunder.


                                   ARTICLE V

                  Rights, Duties, and Powers of Secured Party

    The following rights, duties and powers  of  Secured  Party  are  applicable
irrespective  of whether an Event of Default has occurred and is continuing, but
only after having given Debtor at least three (3) days prior notice:

    Section 5.01   Attorney-in-Fact.  Secured Party  is  hereby fully authorized
and empowered (without the necessity of any  further  consent  or  authorization
from  Debtor)  and  the  right is expressly granted to Secured Party, and Debtor
hereby   irrevocably   appoints   and    makes   Secured   Party   as   Debtor's
attorney-in-fact, with full authority in the place and stead of  Debtor  and  in
the  name  of  Debtor  or  otherwise,  from  time  to  time  in  Secured Party's
discretion, but at Debtor's cost and expense,  to take any action and to execute
any assignment, certificate,  financing  statement,  notification,  document  or
instrument which Secured Party may deem necessary or advisable to accomplish the
purposes  of this Security Agreement, including, without limitation, to receive,
endorse and collect  all  instruments  made  payable  to Debtor representing any
payment or other distribution in respect of the Collateral or any  part  thereof
and to give full discharge for the same.

    Section 5.02   Transfer  of  Collateral.   Secured Party may transfer any or
all of the Obligations, and upon  any  such transfer, Secured Party may transfer
its interest in any or all of the  Collateral  and  shall  be  fully  discharged
thereafter  from all liability therefor.  Any transferee of the Collateral shall
be vested with all rights, powers and remedies of Secured Party hereunder.

                                      -8-

    Section 5.03   Purchase Money Financing.   To  the  extent  that the Lenders
have advanced or will advance funds to or for the account of  Debtor  to  enable
Debtor  to  purchase or otherwise acquire specific types or items of Collateral,
the Lenders may at their option pay  such  funds (i) directly to the Person from
whom Debtor will make such purchase or acquire such rights or (ii) to Debtor, in
which case Debtor covenants  promptly  to  pay  the  same  to  such  Person  and
forthwith furnish to Secured Party, on request, evidence satisfactory to Secured
Party  that  such  payment  has  been made from the funds so provided by Secured
Party for such payment.

    Section 5.04   Proceeds.  If so requested  by  Debtor, any payments received
by Secured Party on the Accounts or as proceeds of other Collateral  shall  upon
final   collection   by  Secured  Party  be  credited  towards  payment  of  the
Obligations.   In  the  absence  of  such  request  from  Debtor,  and  until so
requested, Secured Party may hold such collected  payments  as  cash  Collateral
(and  Secured  Party  may at any time place a hold or freeze on all or a part of
any deposit account of Debtor  containing  deposits  of  such payments up to the
amount of such deposits).

    Section 5.05   Discharge Encumbrances.  Secured Party may,  at  its  option,
discharge any taxes, Liens, security interests or other encumbrances at any time
levied  or placed on the Collateral, may pay for insurance on the Collateral and
may pay for the maintenance  and  preservation of the Collateral.  Debtor agrees
to reimburse Secured Party upon demand for any payment so made, plus interest on
the portion thereof from time to time remaining unpaid from the date of  Secured
Party's  demand  at  the  rate  for  overdue principal and interest set forth in
Section 2.06(c) of the Credit Agreement.

    Section 5.06   Disclaimer of Certain Duties.

    (a)  The powers conferred upon Secured  Party by this Security Agreement are
to protect the interest of Secured Party, the Issuing Banks and the  Lenders  in
the  Collateral  and  shall  not impose any duty upon Secured Party, the Issuing
Banks or any Lender  to  exercise  any  such  powers.  Debtor hereby agrees that
Secured Party, the Issuing Banks and the Lenders shall not be  liable  for,  nor
shall  the  indebtedness  evidenced by the Obligations be diminished by, Secured
Party's delay or failure to collect upon, foreclose, sell, take possession of or
otherwise obtain value for the Collateral.

    (b)  Except as provided  in  the  Credit  Agreement,  Secured Party shall be
under no duty whatsoever to make or give any presentment,  notice  of  dishonor,
protest,  demand for performance, notice of non-performance, notice of intent to
accelerate, notice of acceleration, or other notice or demand in connection with
any Collateral or the Obligations,  or  to  take any steps necessary to preserve
any rights against any Obligor, Account Debtor or other Person.

    Section 5.07   Modification of Obligations; Other Security.   Debtor  waives
(i)  any  and  all  notice of acceptance, creation, modification, rearrangement,
renewal or extension for any period of any instrument executed by any Obligor in
connection with the Obligations and (ii) any defense of any Obligor by reason of
disability, lack of authorization, cessation of the liability of

                                      -9-

any Obligor or for any  other  reason.  Debtor authorizes Secured Party, without
notice or demand and without  any  reservation  of  rights  against  Debtor  and
without  affecting Debtor's liability hereunder or on the Obligations, from time
to time to (x)  take  and  hold  other  Property,  other than the Collateral, as
security for the Obligations, and exchange, enforce, waive and  release  any  or
all  of the Collateral, (y) apply the Collateral in the manner permitted by this
Security Agreement and (z) renew,  extend  for  any period, accelerate, amend or
modify,  supplement,  enforce,  compromise,  settle,  waive   or   release   the
obligations  of  any Obligor or any instrument or agreement of such other Person
with respect to any or all of the Obligations or Collateral.

    Section 5.08   Waiver of Notice;  Demand  and  Presentment; etc.  Except for
any notice required under the Credit Agreement, Debtor hereby waives any demand,
notice of default, notice of acceleration of the maturity  of  the  Obligations,
notice  of  intent  to  accelerate the maturity of the Obligations, presentment,
protest and notice of  dishonor  as  to  any  action  taken  by Secured Party in
connection with this Security Agreement, or any instrument or document.   Debtor
waives  any right of marshaling in respect of any and all Collateral, and waives
any right to require Secured Party,  any  Issuing  Bank or any Lender to proceed
against any Obligor, Account Debtor or other Person, exhaust any  Collateral  or
enforce any other remedy which Secured Party, any Issuing Bank or any Lender now
has or may hereafter have against any Obligor or other Person.

    Section 5.09   Non-judicial  Enforcement.   To the fullest extent allowed by
applicable law, Secured Party  may  enforce  its  rights hereunder without prior
judicial process or judicial hearing, and to the fullest extent permitted by law
Debtor expressly waives any and all legal rights which might  otherwise  require
Secured Party to enforce its rights by judicial process.


                                   ARTICLE VI

                               Events of Default

    Section 6.01   Events  of  Default.   An  Event  of Default under the Credit
Agreement shall constitute an "Event of Default" under this Security Agreement.

    Section 6.02   Remedies.  Upon the occurrence  and during the continuance of
any Event of Default, Secured Party may take any or all of the following actions
without notice (except where expressly required under the  Credit  Agreement  or
below) or demand to Debtor:

    (a)  Declare  all  or  part  of the indebtedness pursuant to the Obligations
immediately due and payable and  enforce  payment  of  the same by Debtor or any
Obligor.

    (b)  Take possession of the Collateral, or at Secured Party's request Debtor
shall, at Debtor's cost, assemble the Collateral and  make  it  available  at  a
location  to  be  specified  by  Secured Party which is reasonably convenient to
Debtor and  Secured  Party.   In  any  event,  Debtor  shall  bear  the  risk of
accidental loss or damage to or diminution in value of the Collateral, and

                                      -10-

Secured Party shall have no  liability  whatsoever  for  failure  to  obtain  or
maintain  insurance,  nor  to  determine  whether any insurance ever in force is
adequate as to amount or as to risk insured.

    (c)  Sell or lease, in  one  or  more  sales  or  leases  and in one or more
parcels, or otherwise dispose of any or  all  of  the  Collateral  in  its  then
condition  or  in  any other commercially reasonable manner as Secured Party may
elect, in a public or private  transaction, at any location as deemed reasonable
by Secured Party (including, without limitation, Debtor's premises), either  for
cash  or  credit  or for future delivery at such price as Secured Party may deem
fair,  and  (unless  prohibited  by  the  Code,  as  adopted  in  any applicable
jurisdiction) Secured Party, any Issuing Bank or any Lender may be the purchaser
of any or all Collateral so sold and may apply upon the purchase price  therefor
any  Obligations  secured  hereby.   Any  such sale or transfer by Secured Party
either to itself or to any other  Person shall be absolutely free from any claim
of right by Debtor, including  any  equity  or  right  of  redemption,  stay  or
appraisal  which  Debtor  has  or  may have under any rule of law, regulation or
statute now existing or  hereafter  adopted.   Upon  any  such sale or transfer,
Secured Party shall have the right  to  deliver,  assign  and  transfer  to  the
purchaser or transferee thereof the Collateral so sold or transferred.  It shall
not  be  necessary  that  the  Collateral  or any part thereof be present at the
location of any such sale  or  transfer.   Secured Party may, at its discretion,
provide for a public sale, and any such public sale shall be held at  such  time
or  times  within ordinary business hours and at such place or places as Secured
Party may fix in the notice of  such sale.  Secured Party shall not be obligated
to make any sale pursuant to any such notice.  Secured Party may, without notice
or publication, adjourn any public or private sale by announcement at  any  time
and place fixed for such sale, and such sale may be made at any time or place to
which the same may be so adjourned.  In the event any sale or transfer hereunder
is  not  completed or is defective in the opinion of Secured Party, such sale or
transfer shall not exhaust the  rights  of  Secured Party hereunder, and Secured
Party shall have the right to cause one or more subsequent sales or transfers to
be made hereunder.  In  the  event  that  any  of  the  Collateral  is  sold  or
transferred  on  credit, or to be held by Secured Party for future delivery to a
purchaser or transferee, the Collateral  so  sold or transferred may be retained
by Secured Party until the purchase price or other consideration is paid by  the
purchaser  or  transferee  thereof,  but  in  the  event  that such purchaser or
transferee fails to pay for  the  Collateral  so  sold or transferred or to take
delivery thereof, neither Secured Party, any Issuing Bank nor any  Lender  shall
incur  any liability in connection therewith.  If only part of the Collateral is
sold or transferred such that the Obligations remain outstanding (in whole or in
part), Secured Party's rights  and  remedies  hereunder  shall not be exhausted,
waived or modified, and Secured Party is specifically empowered to make  one  or
more  successive  sales  or  transfers until all the Collateral shall be sold or
transferred and all the Obligations are  paid.   In the event that Secured Party
elects not to sell the Collateral, Secured Party retains its rights to lease  or
otherwise  dispose  of or utilize the Collateral or any part or parts thereof in
any manner authorized  or  permitted  by  law  or  in  equity,  and to apply the
proceeds of the same towards payment of the Obligations.  Each and every  method
of disposition of the Collateral described in this Section 6.02(c) or in Section
6.02(f) shall constitute disposition in a commercially reasonable manner.

    (d)  Take  possession  of  all books and records of Debtor pertaining to the
Collateral.  Secured Party shall have  the  authority  to enter upon any real or
immoveable property or

                                      -11-

improvements thereon in order to obtain  any  such  books  or  records,  or  any
Collateral located thereon, and remove the same therefrom without liability.

    (e)  Apply  proceeds of the disposition of the Collateral to the Obligations
in any manner elected by Secured  Party  and  permitted by the Code or otherwise
permitted  by  law  or  in  equity.   Such  application  may  include,   without
limitation,  the reasonable expenses of retaking, holding, preparing for sale or
other  disposition,  and  the  reasonable  attorneys'  fees  and  legal expenses
incurred by Secured Party, the Issuing Banks and the Lenders.

    (f)  Appoint any Person as agent to perform any act  or  acts  necessary  or
incident   to  any  sale  or  transfer  by  Secured  Party  of  the  Collateral.
Additionally, any sale or transfer  hereunder  may be conducted by an auctioneer
or any officer or agent of Secured Party.

    (g)  Apply and set-off (A) any deposits of Debtor now or hereafter  held  by
Secured  Party,  the  Issuing  Banks  and  the Lenders; (B) all claims of Debtor
against Secured Party, now or hereafter existing; (C) any other Property, rights
or interests of Debtor which come  into  the  possession or custody or under the
control of Secured Party; and (D) the proceeds of any of the foregoing as if the
same were included in the Collateral.  Secured Party  agrees  to  notify  Debtor
promptly  after  any such set-off or application; provided, however, the failure
of Secured Party to  give  any  notice  shall  not  affect  the validity of such
set-off or application.

    (h)  With respect  to  the  Collateral,  receive,  change  the  address  for
delivery,  open  and dispose of mail addressed to Debtor, and to execute, assign
and endorse negotiable and other instruments for the payment of money, documents
of title or other evidences  of  payment,  shipment  or  storage for any form of
Collateral on behalf of and in the name of Debtor.

    (i)  Notify or require Debtor to notify Account Debtors  that  the  Accounts
have  been  assigned  to  Secured  Party and direct such Account Debtors to make
payments on the Accounts directly to Secured Party.  To the extent Secured Party
does not so elect, Debtor  shall  continue  to  collect and retain the Accounts.
Secured Party or its designee shall also have the right, in its own name  or  in
the name of Debtor, to do any of the following:  (A) to demand, collect, receipt
for,  settle,  compromise  any  amounts due, give acquittances for, prosecute or
defend any action which may be in relation to any monies due or to become due by
virtue of, the Accounts; (B) to  sell,  transfer  or assign or otherwise deal in
the Accounts or the  proceeds  thereof  or  the  related  goods,  as  fully  and
effectively  as  if Secured Party were the absolute owner thereof; (C) to extend
the time of payment  of  any  of  the  Accounts,  to  grant waivers and make any
allowance or other adjustment with reference thereto; (D) to endorse the name of
Debtor on notes, checks or other evidences of payments on  Collateral  that  may
come  into  possession  of  Secured Party; (E) to take control of cash and other
proceeds of any Collateral; (F) to  sign  the  name  of Debtor on any invoice or
bill of lading relating to any Collateral, or any drafts against Account Debtors
or other persons making payment with  respect  to  Collateral;  (G)  to  send  a
request  for  verification  of Accounts to any Account Debtor; and (H) to do all
other acts and things necessary to carry out the intent of this Agreement.

                                      -12-


    (j)  Exercise all other rights and remedies permitted by law or in equity.

    Section 6.03   Liability for Deficiency.  If  any  sale or other disposition
of Collateral by Secured Party or any  Issuing  Bank  or  any  other  action  of
Secured  Party, any Issuing Bank or any Lender hereunder results in reduction of
the Obligations, such  action  will  not  release  Debtor  from its liability to
Secured Party, the Issuing Banks and the Lenders  for  any  unpaid  Obligations,
including costs, charges and expenses incurred in the liquidation of Collateral,
together  with  interest  thereon,  and  the  same  shall be immediately due and
payable to Secured Party at Secured  Party's  address set forth on the signature
page of this Security Agreement.

    Section 6.04   Reasonable Notice.  If any applicable provision  of  any  law
requires  Secured Party any Issuing Bank or any Lender to give reasonable notice
of any sale or disposition  or  other  action, Debtor hereby agrees that fifteen
(15) days' prior written notice  shall  constitute  reasonable  notice  thereof.
Such  notice,  in  the case of public sale, shall state the time and place fixed
for such sale and, in the case  of  private sale, the time after which such sale
is to be made.

    Section 6.05   Account Debtors.  Any payment or  settlement  of  an  Account
made  by  an  Account  Debtor  will  be, to the extent of such payment or to the
extent provided under such settlement,  a  release, discharge and acquittance of
the Account Debtor with respect to such  Account,  and  Debtor  shall  take  any
action  as may be required by Secured Party in connection therewith.  No Account
Debtor on any Account will ever be  bound  to make inquiry as to the termination
of this Agreement or the rights of Secured Party to act hereunder, but shall  be
fully protected by Debtor in making payment directly to Secured Party.


                                  ARTICLE VIII

                                 Miscellaneous

    Section 7.01   Notices.   Any notice required or permitted to be given under
or in connection with this Security  Agreement shall be given in accordance with
the notice provisions of the Guaranty Agreement.

    Section 7.02   Amendments and Waivers.  Secured Party's, any Issuing  Bank's
or any Lender's acceptance of partial or delinquent payments or any forbearance,
failure  or  delay by the Secured Party in exercising any right, power or remedy
hereunder shall not be  deemed  a  waiver  of  any  obligation  of Debtor or any
Obligor, or of any right, power or remedy  of  Secured  Party;  and  no  partial
exercise  of  any  right,  power  or  remedy shall preclude any other or further
exercise thereof.  Secured Party may remedy any Event of Default hereunder or in
connection  with  the  Obligations  without  waiving  the  Event  of  Default so
remedied.  Debtor hereby agrees that if Secured Party agrees to a waiver of  any
provision  hereunder,  or  an  exchange  of or release of the Collateral, or the
addition or release of  any  Obligor,  any  such  action  shall not constitute a
waiver of any of  Secured  Party's  other  rights  or  of  Debtor's  obligations
hereunder.  This Security

                                      -13-

Agreement  may  be  amended  only by the manner set forth in Section 9.02 of the
Credit Agreement by an  instrument  in  writing  executed  jointly by Debtor and
Secured Party and may be supplemented only  by  documents  delivered  or  to  be
delivered in accordance with the express terms hereof.

    Section 7.03   Copy   as   Financing   Statement.    A  photocopy  or  other
reproduction of this Security Agreement  or any financing statement covering the
Collateral is sufficient as a financing statement, and the  same  may  be  filed
with  any  appropriate  filing  authority  for the purpose of perfecting Secured
Party's security interest in the Collateral.

    Section 7.04   Possession of Collateral.  Secured  Party  shall be deemed to
have possession of any Collateral in transit to it or set apart for it  (or,  in
either case, any of its agents, affiliates or correspondents).

    Section 7.05   Redelivery  of  Collateral.   If  any  sale  or  transfer  of
Collateral by Secured Party results in full satisfaction of the Obligations, and
after  such  sale or transfer and discharge there remains a surplus of proceeds,
Secured Party will deliver  to  Debtor  such  excess  proceeds in a commercially
reasonable time; provided, however, that neither Secured Party, any Issuing Bank
nor any Lender shall be liable for any interest, cost or expense  in  connection
with any delay in delivering such proceeds to Debtor.

    Section 7.06   Governing Law; Jurisdiction.  This Security Agreement and the
security  interest  granted  hereby  shall  be  construed in accordance with and
governed by the laws of the State  of  Texas (except to the extent that the laws
of any other jurisdiction govern the perfection and  priority  of  the  security
interests  granted  hereby).   Debtor  consents  to  and  submits to in personam
jurisdiction and venue in the  state  district  and  county courts of the county
wherein Secured Party's offices are located at  the  address  specified  on  the
signature  page  hereof,  and  in  the  Federal  District Courts of the district
wherein  such  offices  of  Secured  Party  are  located.   This  submission  to
jurisdiction is nonexclusive and  does  not  preclude Secured Party, any Issuing
Bank or any Lender from obtaining jurisdiction over Debtor or the Collateral  in
any court otherwise having jurisdiction.

    Section 7.07   Cumulative and Other Rights.  The rights, powers and remedies
of  Secured  Party  hereunder are in addition to all rights, powers and remedies
given by law or in equity.  The  exercise  by Secured Party, any Issuing Bank or
any Lender of any one or more of the rights, powers and  remedies  herein  shall
not  be  construed  as  a  waiver  of  any  other  rights,  powers and remedies,
including, without limitation,  any  other  rights  of  set-off.   If any of the
Obligations are given in renewal, extension for any period or rearrangement,  or
applied  toward the payment of debt secured by any lien, Secured Party shall be,
and is  hereby,  subrogated  to  all  the  rights,  titles,  interests and liens
securing the debt so renewed, extended, rearranged or paid.

    Section 7.08   Subrogation.  Until the Obligations have been paid  in  full,
Debtor  hereby  waives  any  claim, right or remedy which Debtor may now have or
hereafter  acquire  against  the  Company  which  arises  out  of  this Security
Agreement or from the performance by Debtor

                                      -14-

hereunder,  including  without  limitation,  any  claim,  remedy  or  right   of
subrogation,  reimbursement,  exoneration,  indemnification, or participation in
any such claim,  right  or  remedy  of  any  other  Person  against the Company;
provided, however, notwithstanding the foregoing, Debtor reserves its rights  of
contribution and reimbursement, if any, from any Obligor.  Until the Obligations
have  been  paid  in  full,  Debtor  further  waives any benefit of any right to
participate in any security now or  hereafter held by Secured Party, the Issuing
Banks and/or the Lenders.

    Section 7.09   Continuing Security Agreement.

    (a)  This  Security  Agreement  shall  constitute  a   continuing   security
agreement,  and  all  representations  and  warranties, covenants and agreements
shall, as applicable, apply  to  all  future  as  well as existing transactions.
Provisions of this Security Agreement, unless they are by their terms exclusive,
shall be in addition to other agreements between the parties.

    (b)  Except as may be expressly applicable pursuant to Section 9.505 of  the
Code,  no action taken or omission to act by Secured Party, the Issuing Banks or
the Lenders  hereunder,  including,  without  limitation,  any  action  taken or
inaction pursuant to Section 6.02, shall be deemed to constitute a retention  of
the  Collateral  in  satisfaction  of the Obligations or otherwise to be in full
satisfaction of the Obligations, and the  Obligations shall remain in full force
and effect, until Secured Party, the Issuing Banks and the  Lenders  shall  have
applied  payments  (including,  without limitation, collections from Collateral)
towards the Obligations  in  the  full  amount  then  outstanding  or until such
subsequent time as is hereinafter provided in subsection (c) below.

    (c)  To the extent that any payments on the Obligations or proceeds  of  the
Collateral   are   subsequently   invalidated,  declared  to  be  fraudulent  or
preferential, set aside  or  required  to  be  repaid  to  a  trustee, debtor in
possession, receiver or other Person under any bankruptcy  law,  common  law  or
equitable  cause,  then  to  such  extent  the Obligations so satisfied shall be
revived and continue as if  such  payment  or  proceeds had not been received by
Secured Party, the Issuing Banks  or  the  Lenders,  and  Secured  Party's,  the
Issuing  Banks' and the Lenders' security interests, rights, powers and remedies
hereunder shall continue in full force and effect.  In such event, this Security
Agreement shall be automatically  reinstated  if  it shall theretofore have been
terminated pursuant to Section 7.10.

    (d)  In the event that the Obligations are structured such  that  there  are
times  when  no  Indebtedness is owing thereunder, this Security Agreement shall
remain valid and in  full  force  and  effect  as to all subsequent indebtedness
included in the Obligations, provided Secured  Party  has  not  in  the  interim
period   executed  a  written  release  or  termination  statement  or  returned
possession of or reassigned the Collateral to Debtor.

                                      -15-

    Section 7.10   Termination.  The grant of  a security interest hereunder and
all of Secured Party's, the Issuing Banks' and the Lenders' rights,  powers  and
remedies  in  connection  therewith  shall remain in full force and effect until
Secured Party has retransferred and  delivered  all Collateral in its possession
to  Debtor,  and  executed  a  written  release  or  termination  statement  and
reassigned to Debtor without recourse or warranty any remaining  Collateral  and
all  rights  conveyed  hereby.  Upon the complete payment of the Obligations and
the compliance by  Debtor  with  all  covenants  and  agreements hereof, Secured
Party, at the written request and expense of Debtor, will release, reassign  and
transfer  the  Collateral to Debtor and declare this Security Agreement to be of
no further force or  effect.   Notwithstanding  the foregoing, the provisions of
Section 7.09(c) shall survive the termination of this Security Agreement.

    Section 7.11   Counterparts, Effectiveness.  This Security Agreement may  be
executed  in  two or more counterparts.  Each counterpart is deemed an original,
but all such counterparts taken together constitute one and the same instrument.
This Security Agreement becomes  effective  upon  the execution hereof by Debtor
and delivery of the same to Secured Party, and it is not necessary  for  Secured
Party,  the  Issuing  Banks  or  any  Lender to execute any acceptance hereof or
otherwise signify or express its acceptance hereof.

    Section 7.12   Headings Descriptive.  All  titles  or  headings to articles,
sections, subsections or other divisions  of  this  Security  Agreement  or  the
exhibits  hereto  are  only  for the convenience of the parties and shall not be
construed to have any effect  or  meaning  with  respect to the other content of
such articles, sections, subsections or  other  divisions,  such  other  content
being controlling as to the agreement between the parties hereto.

    Section 7.13   Delivery  of  Copy/Waiver.   The  Debtor  hereby acknowledges
receiving a copy of this  Security  Agreement.   The Debtor waives all rights to
receive from the Secured Party a copy of any financing  statement  or  financing
change  statement  filed  or  registered or verification statement issued at any
time in respect of this Security Agreement.

                   [SIGNATURE BEGINS NEXT PAGE]

                                      -16-

                             DEBTOR:

                             TESORO VOSTOK COMPANY


                             By: /s/ G. A. Wright
                                  G. A. Wright
                                  Vice President and Treasurer

                             Address of Chief Executive Office and Location of
                             the Collateral:

                             8700 Tesoro Drive
                             Houston, Texas  78217

                                      -17-