SECOND AMENDMENT TO CREDIT AGREEMENT

     This SECOND AMENDMENT TO CREDIT AGREEMENT (this "Second
Amendment") is entered into as of May 23, 1997, among GIANT
INDUSTRIES, INC., a Delaware corporation (the "COMPANY"), GIANT
INDUSTRIES ARIZONA, INC., an Arizona corporation ("Arizona"),
GIANT EXPLORATION & PRODUCTION COMPANY, a Texas corporation
("Exploration"), SAN JUAN REFINING COMPANY,  a New Mexico
corporation ("San Juan"), GIANT FOUR CORNERS, INC., an Arizona
corporation ("Corners") and CINIZA PRODUCTION COMPANY, a New
Mexico corporation ("Ciniza") (Arizona, Exploration, San Juan,
Corners and Ciniza are individually referred to herein as a
"Guarantor" and collectively as the "Guarantors"), BANK OF
AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION,  as Agent (the
"Agent"), BANK OF AMERICA ILLINOIS, as issuing Bank and as a
Bank, THE FIRST NATIONAL BANK OF CHICAGO (successor to NBD
Bank, by assignment), as a Bank and UNION BANK OF CALIFORNIA,
N.A. (formerly known as Union Bank), as a Bank. Capitalized
terms which are used herein without definition and which are
defined in the Credit Agreement referred to below shall have
the meanings ascribed to them in the Credit Agreement.

     WHEREAS, the Company, the Agent and the Banks are parties
to a certain Credit Agreement dated as of October 4, 1995 (the
"INITIAL AGREEMENT"); and

     WHEREAS, the Company, the Agent and the Banks are parties
to a certain First Amendment to Credit Agreement dated as of
May 15, 1996 (the "FIRST AMENDMENT");

     WHEREAS, the Initial Agreement, as amended by the First
Amendment, and as may be further amended and restated from time
to time, is hereinafter called the "CREDIT AGREEMENT;" and 

     WHEREAS, the Company has requested that the Agent and the
Banks agree to increase the Facility A Commitments to the
aggregate amount of $70,000,000, to extend the Facility A
Termination Date and the Facility B Termination Date and to
further amend the Credit Agreement as herein provided; and
subject to the terms hereof the Agent and the Banks are willing
to agree to the Company s requested modifications;

     NOW, THEREFORE, for good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, the
parties hereto hereby agrees as follows:

     SECTION 1.  AMENDMENTS TO THE CREDIT AGREEMENT. 

     (a)  AMENDMENTS TO ARTICLE I.  ARTICLE I of the Credit
Agreement is hereby amended in the following respects:

          (i)  The definition of "CONSOLIDATED FUNDED
INDEBTEDNESS" set forth in ARTICLE I of the Credit Agreement is
hereby amended to read as follows:

               "CONSOLIDATED FUNDED INDEBTEDNESS" means, for
     the Company and its Consolidated Subsidiaries, at any time,
     without duplication, the sum of: (a) liability for borrowed
     money or for the deferred purchase price of property or
     services, (b) obligations under leases which in accordance
     with GAAP should be recorded as Capital Leases, (c)
     obligations to redeem or purchase any stock or other equity
     security of the Company or a Subsidiary, and (d) any
     guaranty obligations in respect of any of the foregoing.

          (ii)  The definition of "CONSOLIDATED INTEREST
EXPENSE" set forth in ARTICLE I of the Credit Agreement is
hereby amended to read as follows:

               "CONSOLIDATED INTEREST EXPENSE" means for the
     relevant period, for the Company and its Consolidated
     Subsidiaries, without duplication, the sum of: (a) all
     interest in respect of Indebtedness and all lease payments
     with respect to Capital Leases accrued or capitalized
     during such period (whether or not actually paid during
     such period and including fees payable in respect of
     letters of credit and bankers  acceptances), (b) the net
     amount payable (or minus the net amount receivable) under
     all  Swap Contracts during such period (whether or not
     actually paid or received during such period), and (c) all
     dividends paid, declared or otherwise accrued in respect of
     preferred stock.

          (iii) The definition of "ELIGIBLE REFINERY
HYDROCARBON INVENTORY" set forth in ARTICLE I of the Credit
Agreement is hereby amended to read as follows:

               "ELIGIBLE REFINERY HYDROCARBON INVENTORY" means,
     at any date, the aggregate value therefor on a FIFO basis
     calculated in accordance with GAAP of all readily
     marketable, saleable and useful Feedstocks, Intermediate
     Products and Refined Products, owned by the Company and its
     Subsidiaries in field production tanks, storage tanks and
     lines (including line fills but excluding basic sediment
     and water and slop oil) stored on or required for the
     Bloomfield Refinery, the Ciniza Refinery, the Portales
     Refinery, the Company s or its Subsidiaries  service
     stations and travel centers, cardlock fueling stations or
     bulk plants, the Albuquerque Terminal and other Refined
     Products terminals owned or leased by the Company or its
     Subsidiaries."

          (iv) The definitions of "FACILITY A TERMINATION DATE"
and "Facility B Termination Date" set forth in ARTICLE I of the
Credit Agreement are amended to read as follows:

               "FACILITY A TERMINATION DATE" and "FACILITY B
     TERMINATION DATE" means the earlier of (a) May 23, 2000, or
     (b) the date on which such Facility s Commitment terminates
     in accordance with the provisions of this Agreement.

          (v)  The definition of "INDEX DEBT RATING" set forth
in ARTICLE I of the Credit Agreement is hereby amended to read
as follows:

               "INDEX DEBT RATING" means the rating applicable
     to the Company s senior, unsecured, non-credit enhanced
     public long term indebtedness for borrowed money, or if the
     Company has no such rating, the "Index Debt Rating" shall
     be developed by adding two debt rating levels to the rating
     applicable to the Company s existing Senior Subordinated
     Debt.

          (vi)  The following new definitions are hereby added
to ARTICLE I of the Credit Agreement:

               "CAPITAL LEASE" means a capital lease as
     determined in accordance with GAAP.

               "PHOENIX ACQUISITION" means the acquisition of
     stock of Phoenix Fuel Co., Inc. by the Company or by Giant
     Industries Arizona, Inc. that complies with the following:
     (i) such acquisition is pursuant to the terms of the Stock
     Purchase Agreement dated as of April 30, 1997 by and among
     Phoenix Fuel Co., Inc., J.W. Wilhoit, Trustee, the other
     Trustees and Custodian therein named, and Giant Industries
     Arizona, Inc., as may be amended (provided that any
     material amendment shall require consent of the Majority
     Banks), and (ii) the terms and conditions of such
     acquisition shall comply with all material federal, state
     and local laws and regulations, including, but not limited
     to, compliance with the Hart Scott Rodino Act and all other
     applicable laws and regulations.

            "SECOND AMENDMENT CLOSING DATE" means May 23, 1997.

            "THRIFTWAY ACQUISITION" means the acquisition of
     assets by the Company or by Giant Four Corners, Inc. from
     Thriftway Marketing Corp. and Clayton Investment Company
     and their affiliates and related companies that complies
     with the following: (i) such acquisition is pursuant to the
     terms of the Definitive Agreement dated April 18, 1997 by
     and between Giant Four Corners, Inc., Thriftway Marketing
     Corp. and Clayton Investment Company, and the associated
     purchase and sale agreements as provided therein, as may be
     amended (provided that any material amendment shall require
     consent of the Majority Banks), and (ii) the terms and
     conditions of such acquisition shall comply with all
     material federal, state and local laws and regulations,
     including, but not limited to, compliance with the Hart
     Scott Rodino Act and all other applicable laws and
     regulations.

     (b)  AMENDMENTS TO ARTICLE II.  ARTICLE II of the Credit
Agreement is hereby amended in the following respects:

          (i)  SECTION 2.05 is hereby deleted therefrom and the
following SECTION 2.05 is substituted in lieu thereof:

               "2.05  TERMINATION OR REDUCTION OF COMMITMENTS.

                    (a)  VOLUNTARY TERMINATION OR REDUCTION.
          The Company may, upon not less than five Business
          Days  prior notice to the Agent, terminate the
          Commitments, or permanently reduce the Commitments by
          an aggregate minimum amount of $2,000,000.00 or any
          multiple of $1,000,000.00 in excess thereof; UNLESS,
          after giving effect thereto and to any prepayments of
          Loans made on the effective date thereof, (i) the
          Effective Amount of all Facility A Revolving Loans
          exceeds the amount of the combined Facility A
          Revolving Commitment, then in effect, or (ii) the
          Effective Amount of all Facility B Revolving Loans and
          L/C Obligations together would exceed the amount of
          the combined Facility B Revolving Commitments then in
          effect. Once reduced in accordance with this
          subsection, the Commitments may not be increased.

                    (b)  MANDATORY REDUCTION.  The Commitment
          of each Bank under the Facility A Commitment shall be
          automatically reduced on the second anniversary of the
          Second Amendment Closing Date, and such reduction
          shall be equal to $20,000,000.00 in the aggregate.

                    (c)  ADDITIONAL PROVISIONS.  Each reduction
          in aggregate Commitments pursuant to paragraph (a) or
          (b) above shall be applied to each Bank according to
          its Pro Rata Share. All accrued Commitment Fees on the
          amount of the Commitments so terminated or reduced,
          Letter of Credit Fees, and Fronting Fees to, but not
          including, the effective date of any reduction or
          termination of Commitments, shall be paid by the
          Company on the effective date of such reduction or
          termination."

     (c)  AMENDMENTS TO ARTICLE V.  ARTICLE V of the Credit
Agreement is hereby amended in the following respects:

          (i)  SECTION 5.02 is hereby redesignated as SECTION
5.03; and

          (ii) The following shall be inserted as SECTION 5.02:

               "5.02  SPECIAL CONDITIONS PRECEDENT FOR FACILITY
     A ACQUISITIONS.  The obligation of each Bank to make any
     Revolving Loan under Facility A, if the proceeds of such
     Revolving Loan are to be used to make an Acquisition
     involving a purchase price of $10 million or more, is
     subject to the satisfaction of the following conditions
     precedent on the relevant Borrowing Date:

                    (a)  DUE DILIGENCE.  The Agent and the
          Banks shall have completed normal and customary due
          diligence, review and approval of the environmental
          exposures resulting from such acquisition of the
          Company and its existing and prospective Subsidiaries.

                    (b)  COMPLIANCE.  The Acquisition shall be
          permissible under this Agreement.  The terms and
          conditions of such Acquisition shall comply with all
          material federal, state, and local laws and
          regulations, including, but not limited to, compliance
          with the Hart-Scott-Rodino Antitrust Improvements Act
          and all other applicable laws and regulations, and if
          requested by the Agent or the Majority Banks, the
          Company shall furnish an opinion of counsel reasonably
          satisfactory to the Agent and the Majority Banks
          confirming the foregoing."

     (d)  AMENDMENTS TO ARTICLE VI.  ARTICLE VI of the Credit
Agreement is hereby amended in the following respect:  the
following new sentence shall be added to the end of Section
6.08:

     "Margin Stock does not constitute more than 25% of the
     value of the consolidated assets of the Company and its
     Subsidiaries, and the Company does not have any present
     intention that Margin Stock will constitute more than 25%
     of the value of such assets."

     (e)  AMENDMENTS TO ARTICLE VII.  ARTICLE VII of the Credit
Agreement is hereby amended in the following respects:

          (i)  SECTION 7.13 of the Credit Agreement is hereby
deleted therefrom and the following SECTION 7.13 is substituted
in lieu thereof:

               "7.13  Use of Proceeds.  The Company may use the
     proceeds of the Facility A Revolving Loan only for the
     following:  (a) to make capital contributions or loans to
     the Giant Four Corners, Inc. to be used to finance the
     purchase of assets pursuant to the Thriftway Acquisition,
     and to make a capital contribution or loan to Giant
     Industries Arizona, Inc. to finance the purchase of stock
     pursuant to the Phoenix Acquisition, (b) to repurchase
     shares of capital stock of the Company to the extent such
     repurchases are permitted under SECTION 8.09, and (c) to
     make capital contributions and loans to the Guarantors for
     capital expenditures, for general corporate purposes and
     for Acquisitions permitted under this Agreement; provided,
     however, that the Facility A Revolving Loan shall not be
     used by the Company or by the Guarantors for working
     capital expenditures unless all Banks consent.  The Company
     shall use the proceeds of the Facility B Revolving Loan to
     make capital contributions and loans to the Guarantors for
     working capital expenditures, and for issuance of standby
     letters of credit pursuant to Article III hereof in the
     ordinary course of business."

     (f)  AMENDMENTS TO ARTICLE VIII.  ARTICLE VIII of the
Credit Agreement is hereby amended in the following respects:

          (i)  Section 8.01 of the Credit Agreement is hereby
amended by changing the period (".") at the end of SECTION
8.01(j) to "; and", and adding a new SECTION 8.01(k) as
follows:

               "(k)  the Master Lease and Option Agreements
     described on SCHEDULE 8.05."

          (ii)  SECTION 8.05(c) of the Credit Agreement is
hereby amended to read as follows:

               "(c)  Indebtedness described on SCHEDULE 8.05."

          (iii)  SECTION 8.08 of the Credit Agreement is hereby
amended by changing the period (".") at the end of SECTION
8.08(g) to "; and", and adding the following new SECTION
8.08(h) as follows:

               "(h) the guaranties described in SCHEDULE 8.05."

          (iv)  SECTION 8.09(c) of the Credit Agreement is
hereby deleted therefrom and the following SECTION 8.09(c) is
substituted in lieu thereof:

               "(c)  notwithstanding the provisions of SECTION
     8.07(a)(i), the Company may purchase, redeem or otherwise
     acquire shares of its common stock to the extent permitted
     by the terms of the NBD Subordinated Indenture, provided,
     however, that the Company may not purchase, redeem or
     otherwise acquire more than 1,400,000 shares in the
     aggregate in addition to shares acquired prior to March 31,
     1997."

          (v)  SECTION 8.12 of the Credit Agreement is hereby
deleted therefrom and the following SECTION 8.12 is substituted
in lieu thereof:

               "SECTION 8.12  MINIMUM CONSOLIDATED NET WORTH. 
     From and after the Closing Date, the Company will maintain
     at all times Consolidated Net Worth in an amount not less
     than the sum of (i) $109,911,691, plus (ii) 50% of
     Consolidated Net Income computed on a cumulative basis for
     the period beginning March 31, 1997 and ending on the date
     of determination (provided that no negative adjustment will
     be made in the event that Consolidated Net Income is a
     deficit figure for such period), plus (iii) 75% of the
     aggregate amount of the net assets (cash or otherwise)
     received by the Company from the issuance of any class of
     capital stock after March 31, 1997, less (iv) any allowance
     for non-cash write-downs, provided that such allowance on a
     cumulative basis shall not exceed $10,000,000.00."

          (vi)  SECTION 8.14 of the Credit Agreement is hereby
deleted therefrom and the following SECTION 8.14 is substituted
in lieu thereof:

          "SECTION 8.14  CAPITALIZATION RATIO.  From and after
     the Closing Date the Company shall not permit the
     Capitalization Ratio to be greater than 65.0% through
     June 30, 1998, 62.5% after June 30, 1998 up to and
     including June 30, 1999, and thereafter no greater than
     60.0%."

     (g)  AMENDMENT TO SCHEDULE 2.01 (COMMITMENTS).  SCHEDULE
2.01 to the Credit Agreement is hereby deleted and SCHEDULE
2.01a (FACILITY A COMMITMENT) and SCHEDULE 2.01(b) (FACILITY B
COMMITMENT) are hereby added to the Credit Agreement, each in
the form attached to this Amendment.

     (h)  AMENDMENT TO SCHEDULE 2.02 (PRICING). SCHEDULE 2.02
to the Credit Agreement is hereby deleted and a revised
SCHEDULE 2.02 is hereby added to the Credit Agreement, in the
form set forth as SCHEDULE 2.02 to this Amendment.

     (i)  NEW SCHEDULE 8.05 (CERTAIN PERMITTED INDEBTEDNESS AND
CONTINGENT OBLIGATIONS).  A new SCHEDULE 8.05, in the form
attached hereto as SCHEDULE 8.05, is hereby added to the Credit
Agreement.

     SECTION 2.  REPRESENTATIONS AND WARRANTIES.  The Company
and each of the Guarantors represent and warrant to the Agent
and to each of the Banks that:

     (a)  This Amendment, the Credit Agreement as amended
hereby and each Guaranty and each Note have been duly
authorized, executed and delivered by the Company and the
Guarantors who are parties thereto and constitute their legal,
valid and binding obligations enforceable in accordance with
their respective terms (subject, as to the enforcement of
remedies, to applicable bankruptcy, reorganization, insolvency,
moratorium and similar laws affecting creditors  rights
generally and to general principles of equity).

     (b)  The representations and warranties set forth in
ARTICLE V of the Credit Agreement are true and correct in all
material respects before and after giving effect to this
Amendment with the same effect as if made on the date hereof.

     (c)  As of the date hereof, at the time of and immediately
after giving effect to this Amendment, no Default or Event of
Default has occurred and is continuing.

     (d)  No material adverse change in the business, assets,
operations, financial condition, liabilities or capitalization
of the Company and its Subsidiaries has occurred since December
31, 1996.

     SECTION 3.  CONDITIONS OF EFFECTIVENESS.  This Amendment
shall be effective on the date (the "Effective Date") of the
delivery by the Company and the Guarantors to the Agent of the
following:

     (a)  AMENDMENT.  This Amendment, signed by the Company,
the Guarantors, the Agent, and each of the Banks;

     (b)  FACILITY A AND FACILITY B NOTES.  A Facility A Note
and a Facility B Note executed by the Company payable to each
Bank, substantially in the form attached as EXHIBIT F to the
Credit Agreement (such Facility A Notes shall be in renewal,
extension, increase and replacement of the Facility A Notes
executed prior to the date hereof, and such Facility B Notes
shall be in renewal, extension and replacement of the Facility
B Notes executed prior to the date hereof);

     (c)  RESOLUTIONS, ETC.  (i) Resolutions of the board of
directors of the Company and each Guarantor authorizing the
transactions contemplated hereby, certified by the Secretary or
an Assistant Secretary of such Person; (ii) Certificates of the
Secretary or Assistant Secretary of the Company and each
Guarantor certifying the names and true signatures of the
officers or such Person authorized to execute, deliver and
perform, this Amendment, and all other Loan Documents to be
delivered by it hereunder; and (iii) amendments to Articles or
certificates of incorporation and the bylaws of the Company and
each Guarantor made since the Closing Date, certified by the
Secretary or Assistant Secretary of the such Person;

     (d)  GOOD STANDING.  A good standing certificate for the
Company and each Guarantor from the state of incorporation as
of a recent date;

     (e)  LEGAL OPINIONS.  Opinions of counsel to the Company
and addressed to the Agent and the Banks, substantially in the
form of Exhibit "A" hereto;

     (f)  PAYMENT OF FEES.  Evidence of payment by the Company
of all accrued and unpaid fees, costs and expenses owed
pursuant to the Fee Letter among the Company, the Arranger and
the Agent dated as of May 10, 1997; 

     (g)  OTHER.  Such other approvals, opinions and documents
as the Agent or the Majority Banks may reasonably request.

     SECTION 4.  EFFECT OF AMENDMENT.  This Amendment (i)
except as expressly provided herein, shall not be deemed to be
a consent to the modification or waiver of any other term or
condition of the Credit Agreement or of any of the instruments
or agreements referred to therein and (ii) shall not prejudice
any right or rights which the Agent or the Banks may now have
under or in connection with the Credit Agreement, as amended by
this Amendment.  Except as otherwise expressly provided by this
Amendment, all of the terms, conditions and provisions of the
Credit Agreement shall remain the same.  It is declared and
agreed by each of the parties hereto that the Credit Agreement,
as amended hereby, shall continue in full force and effect, and
that this Amendment and such Credit Agreement shall be read and
construed as one instrument.  The Company confirms that the
Facility B Notes executed prior to the date hereof remain in
full force and effect.

     SECTION 5.  GUARANTIES.  Each of the Guarantors hereby
consents to and accepts the terms and conditions of this
Amendment, agrees to be bound by the terms and conditions
hereof, and ratifies and confirms that its Guaranty executed
and delivered in connection with the Credit Agreement is and
remains in full force and effect.

     SECTION 6.  MISCELLANEOUS  This Amendment shall for all
purposes be construed in accordance with and governed by the
laws of the State of Texas.  The captions in this Amendment are
for convenience of reference only and shall not define or limit
the provisions hereof.  This Amendment may be executed in
separate counterparts, each of which when so executed and
delivered shall be an original, but all of which together shall
constitute one instrument.  In proving this Amendment, it shall
not be necessary to produce or account for more than one such
counterpart.


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     NO ORAL AGREEMENTS.  THE CREDIT AGREEMENT (AS AMENDED BY
THE FIRST AMENDMENT AND THIS SECOND AMENDMENT) AND THE OTHER
LOAN DOCUMENTS, 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.

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

                      GIANT INDUSTRIES, INC., 
                      as Company


                      By: /s/ A. Wayne Davenport
                         ____________________________________
                         Name: A. Wayne Davenport
                         Title: Vice President & CFO




                      GIANT INDUSTRIES ARIZONA, INC.  GIANT
                      EXPLORATION & PRODUCTION COMPANY   
                      GIANT FOUR CORNERS, INC.
                      SAN JUAN REFINING COMPANY
                      CINIZIA PRODUCTION COMPANY, 
                      as Guarantors


                      By: /s/ A. Wayne Davenport
                         ____________________________________
                         Name: A. Wayne Davenport
                         in each case, as Vice President

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                      BANK OF AMERICA NATIONAL TRUST AND
                      SAVINGS ASSOCIATION, As Agent


                      By: /s/ J. Stephen Mernick
                         ____________________________________
                         J.  Stephen Mernick
                         Senior Vice President





                      BANK OF AMERICA ILLINOIS, as a Bank
                      and as Issuing Bank


                      By: /s/ J. Stephen Merick
                         ____________________________________
                         J.  Stephen Mernick
                         Senior Vice President

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                      THE FIRST NATIONAL BANK OF CHICAGO


                      By: /s/ Steven Capouch
                         ____________________________________
                         Steven Capouch 
                         First Vice President

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                      UNION BANK OF CALIFORNIA, N.A.


                      By:____________________________________
                         Name:
                         Title: