Use of amines and/or Mannich adducts in fuel and lubricant compositions for direct injection spark ignition engines

A process for reducing deposits in a direct-injection gasoline engine, comprising:

• directly injecting a fuel into a combustion chamber of the direct injection gasoline engine through a nozzle disposed in the combustion chamber;
• wherein the fuel comprises a component B comprising at least one Mannich adduct of the formula I
• where R1 and R2 are each independently H, C1-C20-alkyl or C3-C20-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 groups selected from O and NR4 and/or may be substituted by one or more OR5 or NR6R7 groups, where
• R4, R5, R6 and R7 are each independently H, C1-C20-alkyl or C3-C20-cycloalkyl,
• R8 is a polyisobutene radical which is derived from reactive a polyisobutene polymer having at least 50 mol %, based on the total number of polyisobutene macromolecules, of terminal double bonds,
• R9 is a C1-C6-alkyl group,
• R10 is H or C1-C6-alkyl,
• m is a number from 0 to (4-n) and
• n is a number from 1 to 3,
• with the proviso that the sum of the molecular weights of the radicals NR1R2 is from 120 to 1,000 g/mol.