Patent ID: 8449630

Claim:
A process for reducing deposits in direct-injection gasoline engines which comprises: directly injecting a fuel into a combustion chamber of a gasoline engine, wherein the directly injecting injects the fuel through a common rail into the combustion chamber through a nozzle disposed in the combustion chamber; wherein the fuel comprises: a component A comprising at least one amine of the formula NR 1a R 2a R 3 where each of R 1a , R 2a and R 3 is independently H or C 1 -C 20 -alkyl, wherein the alkyl radicals may be interrupted by one NR 4 group and/or may be substituted by one NR 6 R 7 group where R 4 , R 6 and R 7 are each independently H or C 1 -C 20 -alkyl, and the R 1a , R 2a , and R 3 groups each have a molecular weight of 489 or less; and a component B comprising at least one Mannich adduct of the formula I where R 1 and R 2 are each independently C 1 -C 20 -alkyl or C 3 -C 20 -cycloalkyl, and two alkyl radicals together with the nitrogen atom to which they are bonded may form a ring and the alkyl and the cycloalkyl radicals may be interrupted by one or more O groups, R 8 is a polyisobutene radical, R 9 is a C 1 -C 6 -alkyl group, R 10 is H, m is a number from 0 to (4−n) and n is a number from 1 to 3.