EXHIBIT 23.1 INDEPENDENT ACCOUNTANTS' AWARENESS LETTER Securities and Exchange Commission 450 Fifth Street, N.W. Washington, D.C. 20549 Ladies and Gentlemen: We are aware that Diamond Shamrock, Inc. has included our report dated May 10, 1996 (issued pursuant to the provisions of Statement on Auditing Standards No. 71) in the Prospectus constituting part of its Registration Statement on Form S-3 to be filed on or about May 20, 1996. We are also aware of our responsibilities under the Securities Act of 1933. Yours very truly, /s/ PRICE WATERHOUSE LLP PRICE WATERHOUSE LLP San Antonio, Texas May 17, 1996