METHOD AND USE

摘要

A method of controlling deposits and/or improving the efficiency and/or improving the fuel economy in a direct injection spark ignition gasoline engine comprises adding into the gasoline to be combusted: (i) a detergent compound which is the reaction product of a carboxylic acid-derived acylating agent and an amine; and (ii) optionally, one or more additional components selected from: a) carrier oils comprising an optionally esterified polyether; b) polyetheramines; c) hydrocarbyl-substituted amines wherein the hydrocarbyl substituent is substantially aliphatic and contains at least 8 carbon atoms; d) nitrogen-containing condensates of a phenol, aldehyde and primary or secondary amine; e) aromatic esters of a polyalkylphenoxyalkanol.