COMBINATION OF ADDITIVES FOR FUEL

The invention concerns the use, as a metal deactivator and/or as a metal passivator in a liquid fuel for an internal combustion engine, of a combination comprising at least: (a) a copolymer comprising: - at least one unit of the following formula (I): in which R1' = H or a methyl, u = 0 or 1, E = -O- or -N(Z)- or -O-CO-, or -CO-O- or -NH-CO- or -CO-NH-, in which Z = H or a C1-C6 alkyl, G = an alkyl, an aromatic ring, or an aralkyl, and - at least one unit of the following formula (II): in which R1" = H or methyl, Q = -O- or -NR'- in which R' = H or a C1 to C12 hydrocarbon chain, R comprises a C1 to C34 hydrocarbon chain substituted by at least one quaternary ammonium group and optionally one or more hydroxyl groups, (b) a hydrocarbon compound comprising at least one triazole group.