Patent ID: 7601185

Claim:
A method for cleaning an engine intake system comprising adding to gasoline fuel for the engine a gasoline fuel additive consisting of a synergistic mixture of a detergent additive component (A) and a synthetic carrier oil component (B), wherein i) the detergent additive component (A) is selected from the group consisting of at least one polyalkene monoamine which is substituted by a hydrocarbyl radical having a number average molecular weight of from about 500 to 1 300, the detergent additive component (A) being present in the fuel in an amount of from about 30 to 180 ppm by weight, and wherein ii) the carrier oil component (B) is selected from the group consisting of at least one compound of the following formula I R—O-(A-O) x —H (I) where R is a straight-chain or branched C 6 -C 18 -alkyl group; A is a C 4 -alkylene group and x is an integer from 5 to 35, the carrier oil component (B) being present in the fuel in an amount of from about 10 to 180 ppm by weight.