Exhibit 32.1

THE LUBRIZOL CORPORATION

Certification of Chief Executive Officer and Chief Financial Officer of

The Lubrizol Corporation Pursuant to 18 U.S.C Section 1350

I certify that, to the best of my knowledge and belief, the Quarterly Report on Form 10-Q of The Lubrizol Corporation for the period ending June 30, 2010:

(1)         fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)         the information contained in the report fairly presents, in all material respects, the financial condition and results of operations of The Lubrizol Corporation.

/s/ James L. Hambrick                

James L. Hambrick

Chief Executive Officer and President

August 6, 2010

I certify that, to the best of my knowledge and belief, the Quarterly Report on Form 10-Q of The Lubrizol Corporation for the period ending June 30, 2010:

(1)         fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)         the information contained in the report fairly presents, in all material respects, the financial condition and results of operations of The Lubrizol Corporation.

/s/ Charles P. Cooley            

Charles P. Cooley

Chief Financial Officer

August 6, 2010