Exhibit 32.1

Certification

of

Periodic Financial Report

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

I, Lynn L. Elsenhans, Chairman, Chief Executive Officer and President of Sunoco, Inc., certify that the Quarterly Report on Form 10-Q for the quarter ended March 31, 2010 fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the periodic report fairly presents, in all material respects, the financial condition and results of operations of Sunoco, Inc.

Date: May 6, 2010	/s/ Lynn L. Elsenhans
	Lynn L. Elsenhans
	Chairman, Chief Executive Officer and President