Composition of additives comprising: - at least one copolymer comprising: - at least one unit having the following formula: in which R 1 represents a hydrogen atom or a methyl group, X represents -O-CO-, or -CO-O- or -NH-CO- or -CO-NH-, and R 2 represents a C 12 -C 22 linear or branched acyclic alkyl radical, said copolymer containing from 70 to 95% in moles of units having the formula relative to the total number of moles of the copolymer; and - at least one unit having the following formula: in which R is chosen from the following cycles: a substituted or non-substituted imidazole cycle, a substituted or non-substituted triazole cycle, a substituted or non-substituted pyrrolidone cycle, said copolymer containing from 5 to 30% in moles of units having the formula relative to the total number of moles of the copolymer; and wherein the copolymer is present in a content ranging from 0.1 to 30% by weight relative to the total weight of the composition of additives; - at least one cold flow improver chosen from the copolymers of ethylene and of unsaturated ester(s); - from 1 to 50% by weight of at least one anti-settling additive and/or paraffin dispersant relative to the total weight of the composition of additives. - at least one copolymer comprising: - at least one unit having the following formula: in which R 1 represents a hydrogen atom or a methyl group, X represents -O-CO-, or -CO-O- or -NH-CO- or -CO-NH-, and R 2 represents a C 12 -C 22 linear or branched acyclic alkyl radical, said copolymer containing from 70 to 95% in moles of units having the formula relative to the total number of moles of the copolymer; and - at least one unit having the following formula: in which R is chosen from the following cycles: a substituted or non-substituted imidazole cycle, a substituted or non-substituted triazole cycle, a substituted or non-substituted pyrrolidone cycle, said copolymer containing from 5 to 30% in moles of units having the formula relative to the total number of moles of the copolymer; and wherein the copolymer is present in a content ranging from 0.1 to 30% by weight relative to the total weight of the composition of additives; - at least one unit having the following formula: in which R 1 represents a hydrogen atom or a methyl group, X represents -O-CO-, or -CO-O- or -NH-CO- or -CO-NH-, and R 2 represents a C 12 -C 22 linear or branched acyclic alkyl radical, said copolymer containing from 70 to 95% in moles of units having the formula relative to the total number of moles of the copolymer; and R 1 represents a hydrogen atom or a methyl group, X represents -O-CO-, or -CO-O- or -NH-CO- or -CO-NH-, and R 2 represents a C 12 -C 22 linear or branched acyclic alkyl radical, said copolymer containing from 70 to 95% in moles of units having the formula relative to the total number of moles of the copolymer; and - at least one unit having the following formula: in which R is chosen from the following cycles: a substituted or non-substituted imidazole cycle, a substituted or non-substituted triazole cycle, a substituted or non-substituted pyrrolidone cycle, said copolymer containing from 5 to 30% in moles of units having the formula relative to the total number of moles of the copolymer; and wherein the copolymer is present in a content ranging from 0.1 to 30% by weight relative to the total weight of the composition of additives; R is chosen from the following cycles: a substituted or non-substituted imidazole cycle, a substituted or non-substituted triazole cycle, a substituted or non-substituted pyrrolidone cycle, said copolymer containing from 5 to 30% in moles of units having the formula relative to the total number of moles of the copolymer; and wherein the copolymer is present in a content ranging from 0.1 to 30% by weight relative to the total weight of the composition of additives; - at least one cold flow improver chosen from the copolymers of ethylene and of unsaturated ester(s); - from 1 to 50% by weight of at least one anti-settling additive and/or paraffin dispersant relative to the total weight of the composition of additives.