EXHIBIT 15.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Prospectus constituting part of this Registration Statement on Form S-3 of our report dated February 23, 1996, which is attached as Exhibit 13.3 to Diamond Shamrock, Inc.'s Annual Report on Form 10-K for the year ended December 31, 1995. We also consent to the incorporation by reference of our report on the Financial Statement Schedules, which is included in Item 14(a)(2) of such Annual Report on Form 10-K. We also consent to the references to us under the heading "Experts" in such Prospectus. /s/ PRICE WATERHOUSE LLP PRICE WATERHOUSE LLP San Antonio, Texas May 17, 1996 W3134.TW