| US 7,491,248 B2 | ||
| Fuels compositions and methods for using same | ||
| William J. Colucci, Glen Allen, Va. (US); John T. Loper, Richmond, Va. (US); and Allen A. Aradi, Richmond, Va. (US) | ||
| Assigned to Afton Chemical Corporation, Richmond, Va. (US) | ||
| Filed on Sep. 25, 2003, as Appl. No. 10/670,552. | ||
| Prior Publication US 2005/0066572 A1, Mar. 31, 2005 | ||
| Int. Cl. C10L 1/18 (2006.01); C10L 1/22 (2006.01) | ||
| U.S. Cl. 44—331 [44/415; 44/434; 44/359] | 19 Claims |
| 1. A method for operating a direct injection gasoline engine on an unleaded fuel composition, the method comprising:
supplying a fuel composition comprising
(a) a spark-ignition fuel
(b) a Mannich base detergent; and
(c) a succinimide compound, wherein the Mannich base detergent and succinimide compound are present in a ratio of detergent
to succinimide of from about 16:1 to about 1000:1 by weight; and
introducing into the direct injection gasoline engine, with the combustion intake charge, the fuel composition.
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