A fuel oil additive comprising, in an A:B weight ratio = 10:1 to 1:10, A) a copolymer of ethylene and from 13 to 17 mol% of at least one acrylic ester or vinyl ester having a C 1 -C 18 -alkyl radical and a melt viscosity V 140 of not more than 80 mPas, and B) a comb polymer comprising structural units formed from B1) at least one olefin as monomer 1, which bears at least one C 8 -C 18 -alkyl radical on the olefinic double bond, and B2) at least one ethylenically unsaturated dicarboxylic acid as monomer 2, which bears at least one C 8 -C 16 -alkyl radical bonded via an amide and/or imide group, in which the parameter Q Q = ∑ i w 1 ⁢ i ⋅ n 1 ⁢ i + ∑ j w 2 ⁢ j ⋅ n 2 ⁢ j in which W 1 is the molar proportion of the individual chain lengths n 1 in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths n 2 in the alkyl radicals of the amide and/or imide groups of monomer 2, n 1 are the individual chain lengths in the alkyl radicals of monomer 1, n 2 are the individual chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2, i is the serial variable for the chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2 assumes values of from 23 to 27. A) a copolymer of ethylene and from 13 to 17 mol% of at least one acrylic ester or vinyl ester having a C 1 -C 18 -alkyl radical and a melt viscosity V 140 of not more than 80 mPas, and B) a comb polymer comprising structural units formed from B1) at least one olefin as monomer 1, which bears at least one C 8 -C 18 -alkyl radical on the olefinic double bond, and B2) at least one ethylenically unsaturated dicarboxylic acid as monomer 2, which bears at least one C 8 -C 16 -alkyl radical bonded via an amide and/or imide group, in which the parameter Q Q = ∑ i w 1 ⁢ i ⋅ n 1 ⁢ i + ∑ j w 2 ⁢ j ⋅ n 2 ⁢ j in which W 1 is the molar proportion of the individual chain lengths n 1 in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths n 2 in the alkyl radicals of the amide and/or imide groups of monomer 2, n 1 are the individual chain lengths in the alkyl radicals of monomer 1, n 2 are the individual chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2, i is the serial variable for the chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2 assumes values of from 23 to 27. W 1 is the molar proportion of the individual chain lengths n 1 in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths n 2 in the alkyl radicals of the amide and/or imide groups of monomer 2, n 1 are the individual chain lengths in the alkyl radicals of monomer 1, n 2 are the individual chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2, i is the serial variable for the chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2