SECOND AMENDMENT AND SUPPLEMENT TO
                                CREDIT AGREEMENT

                                     AMONG

                         TESORO PETROLEUM CORPORATION,
                                as the Company,


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


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

                                      and

                    FINANCIAL INSTITUTIONS NOW OR HEREAFTER
                        PARTIES TO THE CREDIT AGREEMENT



                       Effective as of September 1, 1995



                               TABLE OF CONTENTS

                                                               Page
                            ARTICLE I.  DEFINITIONS

    Section 1.01   Terms Defined Above . . . . . . . . . . . . .  1
    Section 1.02   Terms Defined in Credit Agreement . . . . . .  2
    Section 1.03   Other Definitional Provisions . . . . . . . .  2

           ARTICLE II.  AMENDMENTS TO CREDIT AGREEMENT

    Section 2.01   Amendments and Supplements to Definitions . .  2
    Section 2.02   Amendments and Supplements to Article II. . .  3
    Section 2.03   Amendments and Supplements to Article V.. . .  3
    Section 3.01   Sale of Oil and Gas Properties to Coastal . .  3
    Section 3.02   Extent of Waivers . . . . . . . . . . . . . .  3

                     ARTICLE IV.  CONDITIONS

    Section 4.01   Loan Documents. . . . . . . . . . . . . . . .  4
    Section 4.02   Corporate Proceedings of Loan Parties . . . .  4
    Section 4.03   Representations and Warranties. . . . . . . .  4
    Section 4.04   No Default. . . . . . . . . . . . . . . . . .  4
    Section 4.05   Security Instruments. . . . . . . . . . . . .  4
    Section 4.06   Other Instruments or Documents. . . . . . . .  4

                    ARTICLE V.  MISCELLANEOUS

    Section 5.01   Adoption, Ratification and Confirmation
                   of Credit Agreement . . . . . . . . . . . . .  5
    Section 5.02   Ratification and Affirmation of Guaranty. . .  5
    Section 5.03   Successors and Assigns. . . . . . . . . . . .  5
    Section 5.04   Counterparts. . . . . . . . . . . . . . . . .  5
    Section 5.05   Number and Gender . . . . . . . . . . . . . .  5
    Section 5.06   Entire Agreement. . . . . . . . . . . . . . .  5
    Section 5.07   Invalidity. . . . . . . . . . . . . . . . . .  6
    Section 5.08   Titles of Articles, Sections and Subsections.  6
    Section 5.09   Governing Law . . . . . . . . . . . . . . . .  6

                                      -i-

                       SECOND AMENDMENT AND SUPPLEMENT TO
                                CREDIT AGREEMENT


    This SECOND  AMENDMENT  AND  SUPPLEMENT  TO  CREDIT  AGREEMENT (this "Second
Amendment") executed effective as  of  the  1st  day  of  September,  1995  (the
"Effective  Date"),  is  by  and  among TESORO PETROLEUM CORPORATION, a Delaware
corporation  (the  "Company");   TEXAS   COMMERCE   BANK  NATIONAL  ASSOCIATION,
individually, as an Issuing Bank and as Agent; BANQUE PARIBAS, individually,  as
an  Issuing Bank and as Co-Agent, each of the lenders that is a signatory hereto
or which becomes a  signatory  hereto  and  to  the hereinafter described Credit
Agreement as provided in Section 8.07 of the Credit Agreement  (individually,  a
"Lender" and collectively, the "Lenders").

                              W I T N E S S E T H:

    WHEREAS, the Company, the  Agent,  the  Co-Agent,  the Issuing Banks and the
Lenders are parties to that certain Credit Agreement dated as of April 20, 1994,
as amended by First Amendment to Credit Agreement dated effective as of December
31, 1994 (as amended, the "Credit Agreement"), pursuant  to  which  the  Lenders
agreed  to  make loans and issue Letters of Credit to and for the account of the
Company; and

    WHEREAS, Tesoro E&P Company,  L.P.,  a Delaware limited partnership ("Tesoro
LP"), by and through its general  partner,  Tesoro  Exploration  and  Production
Company, and Coastal Oil & Gas of Texas, L.P. ("Coastal LP"), by and through its
general  partner,  Coastal  Oil & Gas Corporation have entered into that certain
Purchase and Sale Agreement dated as of  September 1, 1995, whereby Tesoro LP is
selling to Coastal LP certain of its Oil and Gas Properties which are encumbered
by Liens in favor of the Agent pursuant to the E&P Mortgage.

    WHEREAS, the Company and Tesoro LP desire that the Agent release its Lien in
such Oil and Gas Properties being sold to Coastal  LP  and  the  Agent  and  the
Lenders  have  agreed  to  release  such  Lien,  subject  to  the provisions and
conditions contained herein;

    WHEREAS, as a result of the foregoing, the Company, the Agent, the Co-Agent,
Guarantors  and  the  Lenders  desire  to  amend  the  Credit  Agreement  in the
particulars hereinafter provided;

    NOW, THEREFORE, in consideration of the premises and  the  mutual  covenants
herein contained, the parties hereto agree as follows:


                            ARTICLE I.  DEFINITIONS

    Section 1.01 Terms Defined Above.  As used in this Second Amendment, each of
the terms "Company", "Coastal LP", "Credit Agreement", "Effective Date", "Second

                                      -1-

Amendment",  "Lenders",  "Coastal Purchase and Sale Agreement", "Tesoro E&P" and
"Tesoro LP" shall have the meaning assigned to such term hereinabove.

    Section 1.02 Terms Defined in  Credit  Agreement.   Each term defined in the
Credit Agreement and used herein  without  definition  shall  have  the  meaning
assigned  to such term in the Credit Agreement, unless expressly provided to the
contrary.

    Section 1.03   Other Definitional Provisions.

         (a)  The words  "hereby",  "herein",  "hereinafter", "hereof", "hereto"
    and "hereunder" when used in this  Second  Amendment  shall  refer  to  this
    Second  Amendment  as  a  whole  and not to any particular Article, Section,
    subsection or provision of this Second Amendment.

         (b)  Section, subsection  and  Exhibit  references  herein  are to such
    Sections, subsections and Exhibits to this Second Amendment unless otherwise
    specified.


                  ARTICLE II.  AMENDMENTS TO CREDIT AGREEMENT

    The Company, the Agent, the Co-Agent, the  Issuing  Banks  and  the  Lenders
agree that the Credit Agreement is hereby amended and supplemented, effective as
of the Effective Date, in the following particulars.

    Section 2.01   Amendments and Supplements to Definitions.

         (a)  The  definition  of  "Agreement"  in  Section  1.01  of the Credit
    Agreement is hereby amended  to  mean  the  Credit Agreement, as amended and
    supplemented by this Second Amendment and as the same may from time to  time
    be further amended, supplemented or modified.

         (b)  Section 1.01 of the Credit Agreement is hereby further amended and
    supplemented  by  adding  the following new definitions where alphabetically
    appropriate, which read in their entirety as follows:

              "Second Amendment" shall  mean  that  certain Second Amendment and
         Supplement to Credit Agreement dated as of September 1,  1995,  by  and
         among  the  Company, the Agent, the Co-Agent, the Issuing Banks and the
         Lenders.

              "Coastal Purchase  and  Sale  Agreement"  shall  mean that certain
         Purchase and Sale Agreement dated as  of  September  1,  1995,  by  and
         between  Tesoro  LP,  acting by and through its general partner, Tesoro
         E&P, as seller, and Coastal Oil & Gas of Texas, L.P., a Texas limited

                                      -2-

         partnership, acting by and through  its  general partner, Coastal Oil &
         Gas Corporation, as purchaser.

    Section 2.02   Amendments and Supplements to Article II.  Section 2.20(a) of
the Credit Agreement is hereby amended by deleting the last sentence thereof and
substituting therefor the following:

         "During the period from and after the  effective  date  of  the  Second
    Amendment  until  the  next Redetermination Date, the amount of the E&P Loan
    Value shall be $40,000,000."

    Section 2.03   Amendments and Supplements to  Article V. Section 5.04 of the
Credit Agreement is hereby amended and supplemented  by  adding  thereto  a  new
subsection (p) to read in its entirety:

            "(p)   Proceeds   of   Coastal  Sale.   Permit  Tesoro  LP,  without
    obtaining prior written approval from  the  Majority Lenders and in exchange
    for the Lenders agreeing to the release of the associated Liens, to use  the
    proceeds  received  by  Tesoro  LP  from  the  sale  of Oil & Gas Properties
    pursuant  to  the   Coastal   Purchase   and   Sale  Agreement  for  Capital
    Expenditures, acquisitions or repayment of debt  incurred  pursuant  to  the
    Subordinated  Debentures  or  in  any  other manner, except (i) to hold in a
    demand deposit account (ii) to  reduce  Lender Indebtedness or (iii) to make
    investments permitted by clauses (ii), (iii) and (vi) of Section 5.04(e).


                             ARTICLE III.  WAIVERS

    Section 3.01   Sale of Oil and Gas Properties to Coastal.   The  Agent,  the
Co-Agent,  the Issuing Banks and the Lenders agree that the Company shall not be
deemed to be in default of  the  Credit  Agreement  solely by reason of the fact
that Tesoro LP has entered into and will perform under the Coastal Purchase  and
Sale Agreement.

    Section 3.02   Extent of Waivers.   The  foregoing waivers and consent shall
not be deemed to be a waiver or consent by the Agent, the Co-Agent, the  Issuing
Banks and the Lenders of any other covenant, condition or obligation on the part
of  the Company or any Subsidiary of the Credit Agreement or any other Financing
Document, except as set  forth  in  Section  3.01  of this Second Amendment.  In
addition, the foregoing waiver and consent shall  in  no  respect  evidence  any
commitment by the Agent, the Co-Agent, the Issuing Banks or the Lenders to grant
any  future  waivers or consents of any covenant, condition or obligation on the
part of the Company or any  Subsidiary  under  the Credit Agreement or any other
Financing Document.  Any further waivers or consents must be specifically agreed
to in writing in accordance with Section 8.02 of the Credit Agreement.

                                      -3-

                            ARTICLE IV.  CONDITIONS

    The enforceability of this Second Amendment against the Agent, the Co-Agent,
the Issuing Banks and  the  Lenders  is  subject  to  the  satisfaction  of  the
following conditions precedent:

    Section  4.01   Loan  Documents.   The  Agent  shall  have received multiple
original counterparts, as  requested  by  the  Agent,  of  this Second Amendment
executed and delivered by a duly authorized officer of the Company, each of  the
Guarantors,  the  Agent,  the  Co-Agent,  each  Issuing Bank and each Lender, as
applicable;

    Section 4.02   Corporate Proceedings of Loan  Parties.  The Agent shall have
received multiple copies, as requested by the Agent, of the resolutions, in form
and substance reasonably satisfactory to the Agent, of the Boards  of  Directors
of  the  Company  and  the  Guarantors,  authorizing the execution, delivery and
performance of this  Second  Amendment,  each  such  copy  being  attached to an
original certificate of the Secretary or an Assistant Secretary of  the  Company
or the Guarantors, as applicable, dated as of the Effective Date, certifying (i)
that  the  resolutions attached thereto are true, correct and complete copies of
resolutions duly adopted by written  consents  or  at  meetings of the Boards of
Directors, (ii) that such resolutions constitute all  resolutions  adopted  with
respect  to  the  transactions  contemplated hereby, (iii) that such resolutions
have not been amended, modified, revoked  or rescinded as of the Effective Date,
(iv) that the respective articles of incorporation and bylaws of the Company and
the Guarantors have not been amended or otherwise modified since  the  effective
date  of  the  Credit  Agreement,  except  pursuant  to  any amendments attached
thereto, and (v) as  to  the  incumbency  and  signature  of the officers of the
Company or the Guarantors, as applicable, executing this Second Amendment.

    Section 4.03   Representations and Warranties.  Except as  affected  by  the
transactions  contemplated  in  the  Credit Agreement and this Second 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
Effective Date, as if made on and as of such date.

    Section 4.04   No  Default.   No  Default  or  Event  of  Default shall have
occurred and be continuing as of the Effective Date.

    Section  4.05   Security  Instruments.   All  of  the  Security  Instruments
(subject to any partial releases thereof) shall be in full force and effect  and
provide to the Agent the security intended thereby to secure the Indebtedness.

    Section  4.06   Other  Instruments or Documents.  The Agent or any Lender or
counsel to the Agent shall receive  such  other instruments or documents as they
may reasonably request.

                                      -4-

                           ARTICLE V.  MISCELLANEOUS

    Section 5.01   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  5.02   Ratification  and  Affirmation  of  Guaranty.   Each  of the
Guarantors hereby expressly (i) acknowledges the terms of this Second 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 5.03   Successors  and  Assigns.   This  Second  Amendment  shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and assigns permitted pursuant to the Credit Agreement.

    Section 5.04   Counterparts.  This Second Amendment may be executed  by  one
or more of the parties hereto in any number of separate counterparts, and all of
such  counterparts taken together shall be deemed to constitute one and the same
instrument and shall be enforceable as  of the Effective Date upon the execution
of one or more counterparts hereof by the Company, the  Guarantors,  the  Agent,
the  Co-Agent,  the  Issuing Banks and the Lenders.  In this regard, each of the
parties  hereto  acknowledges  that  a  counterpart  of  this  Second  Amendment
containing a set of counterpart execution pages reflecting the execution of each
party hereto  shall  be  sufficient  to  reflect  the  execution  of this Second
Amendment by each necessary party hereto and shall constitute one instrument.

    Section 5.05   Number and Gender.  Whenever the context requires,  reference
herein  made to the single number shall be understood to include the plural; and
likewise, the  plural  shall  be  understood  to  include  the  singular.  Words
denoting sex shall be construed to include the masculine, feminine  and  neuter,
when  such  construction  is  appropriate;  and  specific  enumeration shall not
exclude the general but shall be  construed as cumulative.  Definitions of terms
defined in the singular or plural shall be equally applicable to the  plural  or
singular, as the case may be, unless otherwise indicated.

    Section  5.06   Entire  Agreement.   This  Second  Amendment constitutes the
entire agreement among the parties  hereto  with  respect to the subject hereof.
All prior understandings, statements and agreements, whether  written  or  oral,
relating to the subject hereof are superseded by this Second Amendment.

                                      -5-

    Section  5.07   Invalidity.   In  the  event  that  any  one  or more of the
provisions contained in  this  Second  Amendment  shall  for  any reason be held
invalid, illegal or unenforceable in any respect, such invalidity, illegality or
unenforceability shall not affect any other provision of this Second Amendment.

    Section 5.08   Titles of Articles, Sections and Subsections.  All titles  or
headings  to  Articles,  Sections, subsections or other divisions of this Second
Amendment or the exhibits hereto, if  any,  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,  other  divisions  or
exhibits,  such  other  content  being  controlling  as  the agreement among the
parties hereto.

    Section 5.09   Governing  Law.  This  Second  Amendment  and  the rights and
obligations of the parties hereunder and under the  Credit  Agreement  shall  be
governed  by and construed in accordance with the laws of the State of Texas and
the United States of America.

    This  Second  Amendment,   the   Credit   Agreement,  as  amended  and
    supplemented hereby, the Notes,  and  the  other  Financing  Documents
    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 Second Amendment  to
be  duly  executed and delivered by their proper and duly authorized officers as
of the Effective Date.

COMPANY:                     TESORO PETROLEUM CORPORATION


                             By: /s/ William T. Van Kleef
                             Name:  William T. Van Kleef
                             Title: Vice President, Treasurer


AGENT, ISSUING BANK
AND LENDER:                  TEXAS COMMERCE BANK NATIONAL
                             ASSOCIATION, individually, as an Issuing Bank and
                             as Agent


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

CO-AGENT, ISSUING BANK       BANQUE PARIBAS, individually, as an Issuing
AND LENDER:                  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


LENDERS:                     BANK OF SCOTLAND


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

                                      -7-

                             CHRISTIANIA BANK


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


                             THE BANK OF NOVA SCOTIA


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


                             NBD BANK


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


                             BANK OF AMERICA ILLINOIS

                             By: /s/ Ronald McKaig
                             Name: Ronald McKaig
                             Title: Vice President


                             FIRST UNION NATIONAL BANK OF NORTH
                             CAROLINA

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

                                      -8-

                             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

                             THE FROST NATIONAL BANK

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


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 Treasuer

                                      -9-

                             TESORO E&P COMPANY, L.P.

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


                             By: /s/ William T. Van Kleef
                                   William T. Van Kleef
                                 Vice President and Treasurer


                             TESORO GAS RESOURCES COMPANY, INC


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

                                      -10-