Exhibit 4.8

                               (Front side)

Incorporated under the laws                                 COMMON STOCK
of the State of Delaware                                    PAR VALUE $.01

NUMBER                                                         SHARES

This Certificate is transferable in                         CUSIP 904000 10 6
New York, New Jersey, Toronto, Montreal                     See Reverse for 
Vancouver, Calgary and Halifax                              certain definitions


                   ULTRAMAR DIAMOND SHAMROCK CORPORATION


     This certifies that



     is the owner of

        FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF

ULTRAMAR DIAMOND SHAMROCK CORPORATION transferable on the books of the Company
in person or by attorney on surrender of this certificate properly endorsed. 
This certificate is not valid until countersigned by the Transfer of Agent and
registered by the Registrar.

     Witness the seal of the Company and the facsimile signatures of its duly
authorized
officers.

/s/  R. R. Hemminghaus               CORPORATE   COUNTERSIGNED AND REGISTERED:
     Chairman of the Board             SEAL       REGISTRAR 
       and Chief Executive Officer                  AND        OR
                                                  TRANSFER     
                                                               TRANSFER AGENT 
                                                                AND REGISTRAR
     Patrick J. Guarino
/s/  Executive Vice President,                  By:              By:  
     General Counsel and Secretary                    
                                             

                                             Authorized       Authorized
                                             Signatory        Signatory    
  

                               REVERSE SIDE

The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM - as tenants in common            UNIF GIFT MIN ACT -____Custodian 
TENENT -- as tenants by the entireties           (Cust)        (Minor)
JT TEN -- as joint tenants with right of        under Uniform Gifts to Minors
         survivorship and not as tenants     
         in common                              Act_________________________
                                                            (State)

  Additional abbreviations may also be used though not in the above list.

For value received, ___________ hereby sell, Pour une contrepartie de valeur,
assign and transfer unto                          ___________________ cede(nt) a

PLEASE INSERT SOCIAL SECURITY OR OTHER    NUMERO D'ASSURANCE SOCIALE QU
   IDENTIFYING NUMBER OF ASSIGNEE
            
   _____________________________           __________________________
                                                    
_______________________________________________________________________________
PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE

_______________________________________________________________________________
NOM ET ADRESSE (Y COMPRIS LE CODE POSTAL) DU CESSIONNAIRE EN CARACTERES
D'IMPRIMERIE

________________________________________________________________________________

________________________________________________________________________________
shares of the capital stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint

_______________________________________________________________________________
actions du capital representees par le present certificat et nomme(nt)
irrevocablement

________________________________________________________________________________
attorney to transfer the said stock on the books of the within named Corporation
with full power of substitution in the premises.

________________________________________________________________________________
mandatire pour transferer ces actions aux registres de la societe nomme aux
presentes, avec pleins pouvolrs de substitution.

Dated:_________________________         Dated:_________________________

NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION
OR ENLARGEMENT OR ANY CHANGE
WHATEVER. 

AVIS:  LA SIGNATURE DU PRESENT FORMULAIRE DE TRANSFERT DOIT CORRESPONDRE EN TOUS
POINTS AU NOM ECRIT AU RECTO DU PRESENT CERTIFICAT, SANS MODIFICATION NI
AGRANDISSEMENT.

   This certificate also evidences and entitles the holder hereof to certain
Rights as set forth in a Rights Agreement dated as of June 25, 1992, as it may
be amended from time to time (the "Rights Agreement"), between Ultramar Diamond
Shamrock Corporation and Registrar and Transfer Company, as successor Rights
Agent, the terms of which are hereby incorporated herein by reference and a copy
of which is on file at the principal executive offices of Ultramar Diamond
Shamrock Corporation.  Under certain circumstances, as set forth in the
Rights Agreement, such Rights will be evidenced by separate certificates and
will no longer be evidenced by this certificate.  Ultramar Diamond Shamrock
Corporation will mail to the holder of this certificate a copy of the Rights
Agreement without charge after receipt of a request therefor.  Rights
beneficially owned by Acquiring Persons or their Affiliates or Associates (as
such terms are defined in the Rights Agreement) and by any subsequent holder
of such Rights are null and void and nontransferable.

     The authorized shares of Ultramar Diamond Shamrock Corporation include
preferred stock.  A statement of the powers, designations, preferences and
relative, participating, optional or other special rights of each class of
preferred stock or series thereof and the qualifications, limitations or
restrictions of such preferences and/or rights will be furnished by the
Corporation without charge to each stockholder who so requests.  Any such
request is to be addressed to the Secretary of Ultramar Diamond Shamrock
Corporation or to the transfer agent named on the face of this certificate.
  
W5011.TW