UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 4
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
( ) Check this box if no longer subject to Section 16.
Form 4 or Form 5 obligations may continue. See Instructions 1(b).
1. Name and Address of Reporting Person
   Gaulin, Jean
   P.O. Box 696000
   San Antonio, TX  78269-6000
2. Issuer Name and Ticker or Trading Symbol
   Ultramar Diamond Shamrock Corporation
   (UDS)
3. IRS or Social Security Number of Reporting Person (Voluntary)

4. Statement for Month/Year
   February 29, 2000
5. If Amendment, Date of Original (Month/Year)

6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
   ( ) Director ( ) 10% Owner (X) Officer (give title below) ( ) Other
   (specify below)
   Chairman, President and Chief Executive Officer
7. Individual or Joint/Group Filing (Check Applicable Line)
   (X) Form filed by One Reporting Person
   ( ) Form filed by More than One Reporting Person


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 Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned                                                 |
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1. Title of Security       |2.    |3.    |4.Securities Acquired (A)         |5.Amount of        |6.Dir |7.Nature of Indirect       |
                           | Transaction |  or Disposed of (D)              |  Securities       |ect   |  Beneficial Ownership     |
                           |      |      |                                  |  Beneficially     |(D)or |                           |
                           |      |    | |                  | A/|           |  Owned at         |Indir |                           |
                           | Date |Code|V|    Amount        | D |    Price  |  End of Month     |ect(I)|                           |
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Common Stock               |2/7/00|A   |V|34,300            |A  |$23.3125   |122,577(b)         |D     |                           |
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 Table II -- Derivative Securitites Acquired, Disposed of, or Beneficially Owned                                                   |
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1.Title of Derivative |2.Con-  |3.   |4.    |5.Number of De |6.Date Exer|7.Title and Amount  |8.Price|9.Number    |10.|11.Nature of|
  Security            |version |Transaction | rivative Secu |cisable and|  of Underlying     |of Deri|of Deriva   |Dir|Indirect    |
                      |or Exer |     |      | rities Acqui  |Expiration |  Securities        |vative |tive        |ect|Beneficial  |
                      |cise    |     |      | red(A) or Dis |Date(Month/|                    |Secu   |Securities  |(D)|Ownership   |
                      |Price of|     |      | posed of(D)   |Day/Year)  |                    |rity   |Benefi      |or |            |
                      |Deriva- |     |      |               |Date |Expir|                    |       |ficially    |Ind|            |
                      |tive    |     |      |           | A/|Exer-|ation|   Title and Number |       |Owned at    |ire|            |
                      |Secu-   |     |    | |           | D |cisa-|Date |   of Shares        |       |End of      |ct |            |
                      |rity    |Date |Code|V|  Amount   |   |ble  |     |                    |       |Month       |(I)|            |
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Employee stock option |        |2/7/0|A   |V|131,000    |A  |(aa) |2/7/1|Common Stock|131,000|$23.312|1,127,925   |D  |            |
(right to buy) (g)    |        |0    |    | |           |   |     |0    |            |       |5      |            |   |            |
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                      |        |     |    | |           |   |     |     |            |       |       |            |   |            |
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Explanation of Responses:
(b)  34,300 of such shares were issued pursuant to Long Term Incentive Plans
and remain subject to forfeiture as of
February 29, 2000.
(g) Employee Stock option granted under the Company's  Long-Term Incentive
Plans.
(aa) Option granted to the reporting person under Long-Term Incentive Plan
exempt under Rule 16b-3.  The option
becomes exercisable in 30%, 30% and 40% increments on February 7, 2001,
February 7, 2002 and February 7,
2003, respectively.
SIGNATURE OF REPORTING PERSON
/s/ JEAN GAULIN (Power of Attorney)
DATE
March 10, 2000