A fuel oil composition comprising an oil mixture F) having a cloud point of above -9°C and consisting of F1) 89-50% by volume of a fuel oil of mineral origin and F2) 11-50% by volume of a fuel oil of vegetable and/or animal origin, and 0.001 to 5% by weight of a cold additive, comprising the constituents A and B in the weight ratio 20:1 to 1:20 A) at least one copolymer composed of ethylene and 8-21 mol% of at least one acrylic or vinyl ester having a C 1 -C 18 -alkyl radical and B) at least one comb polymer containing structural units composed of 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) maleic anhydride as monomer 2 which bears at least one C 8 -C 16 alkyl radical bonded via an ester moiety, in a molar ratio B1):B2) = 1.5:1 to 1:1.5, where the sum Q Q = ∑ i w 1 ⁢ i ⋅ n 1 ⁢ i + ∑ j w 2 ⁢ j ⋅ n 2 ⁢ j of the molar averages of the carbon chain length distributions in the alkyl radicals of monomer 1 on the one hand and the alkyl radicals of the ester groups of monomer 2 on the other is from 21.0 to 28.0, where w 1 is the molar proportion of the individual chain lengths in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths in the alkyl radicals of the ester 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 ester groups of monomer 2, i is the serial variable for the individual chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the individual chain lengths in the alkyl radicals of the ester groups of monomer 2. F1) 89-50% by volume of a fuel oil of mineral origin and F2) 11-50% by volume of a fuel oil of vegetable and/or animal origin, and 0.001 to 5% by weight of a cold additive, comprising the constituents A and B in the weight ratio 20:1 to 1:20 A) at least one copolymer composed of ethylene and 8-21 mol% of at least one acrylic or vinyl ester having a C 1 -C 18 -alkyl radical and B) at least one comb polymer containing structural units composed of 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) maleic anhydride as monomer 2 which bears at least one C 8 -C 16 alkyl radical bonded via an ester moiety, in a molar ratio B1):B2) = 1.5:1 to 1:1.5, where the sum Q Q = ∑ i w 1 ⁢ i ⋅ n 1 ⁢ i + ∑ j w 2 ⁢ j ⋅ n 2 ⁢ j of the molar averages of the carbon chain length distributions in the alkyl radicals of monomer 1 on the one hand and the alkyl radicals of the ester groups of monomer 2 on the other is from 21.0 to 28.0, where w 1 is the molar proportion of the individual chain lengths in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths in the alkyl radicals of the ester 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 ester groups of monomer 2, i is the serial variable for the individual chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the individual chain lengths in the alkyl radicals of the ester groups of monomer 2. 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) maleic anhydride as monomer 2 which bears at least one C 8 -C 16 alkyl radical bonded via an ester moiety, w 1 is the molar proportion of the individual chain lengths in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths in the alkyl radicals of the ester 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 ester groups of monomer 2, i is the serial variable for the individual chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the individual chain lengths in the alkyl radicals of the ester groups of monomer 2.