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