METHOD FOR REDUCING DEPOSITS IN AN ENGINE WITH A FUEL COMPOSITION COMPRISING A DETERGENT AND A QUATERNARY AMMONIUM SALT ADDITIVE

摘要

A method of reducing deposits in a diesel engine, the method comprising combusting in the engine a diesel fuel composition comprising a detergent additive which is not a quaternary ammonium salt or a Mannich reaction product; and a quaternary ammonium salt additive comprising the reaction product of nitrogen containing species having at least one tertiary amine group and a quaternizing agent; wherein the nitrogen containing species is selected from:
(i) the reaction product of a hydrocarbyl-substituted acylating agent and a compound comprising at least one tertiary amine group and a primary amine, secondary amine or alcohol group;
(ii) a Mannich reaction product comprising a tertiary amine group; and
(v) a polyalkylene substituted amine having at least one tertiary amine group.