Fuels compositions and methods for using same
View Patent ↗A fuel composition and methods for using it for controlling deposit formation in a spark-ignition internal combustion engine, such as a direct injection engine, comprising a spark-ignition fuel, a detergent, and a deposit inhibitor compound.
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;
(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
(d) a manganese compound; and
introducing into the direct injection gasoline engine, with the combustion intake charge, the fuel composition.
2. The method as described in claim 1 , wherein the manganese compound comprises a fuel-soluble cyclopentadienyl manganese tricarbonyl compound.