An additive composition comprising a viscosity index improver and a pour point depressant, wherein the viscosity index improver is a polymer having a weight average molecular weight (Mw) of 100,000 to 1,000,000 g/mol and obtainable by polymerizing a monomer composition comprising: a) 10 to 30 % by weight of one or more polybutadiene-based macromonomer a) having a number-average molecular weight of 500 to 10,000 g/mol, based on the total weight of the viscosity improver monomer composition, b) 50 to 70 % by weight of methyl(meth)acrylate, butyl(meth)acrylate, one monomer having from 8 to 17 carbon atoms selected from a group consisting of styrene or a substituted styrene having an alkyl substituent in the side chain or a mixture thereof, based on the total weight of the viscosity improver monomer composition, c) 1 to 15 % by weight of one monomer selected from linear or branched C 7 -C 30 alkyl(meth)acrylates or a mixture thereof, based on the total weight of the viscosity improver monomer composition, wherein the pour point depressant is a polymer having a weight average molecular weight (Mw) of 10,000 to 60,000 g/mol and obtainable by polymerizing a monomer composition comprising: e) 20 to 35 % by weight of one monomer selected from linear or branched C 1 -C 6 alkyl(meth)acrylate or a mixture thereof, f) 20 to 75 % by weight of one monomer selected from linear or branched C 7 -C 15 alkyl(meth)acrylates, based on the total weight of the monomer composition, g) 5 to 60 % by weight of at least one monomer selected from linear or branched C 16 -C 24 alkyl(meth)acrylates, based on the total weight of the monomer composition, wherein the weight ratio of to is 99:1 to 80:20, based on the total solid polymer content of polymers and in the additive composition. wherein the viscosity index improver is a polymer having a weight average molecular weight (Mw) of 100,000 to 1,000,000 g/mol and obtainable by polymerizing a monomer composition comprising: a) 10 to 30 % by weight of one or more polybutadiene-based macromonomer a) having a number-average molecular weight of 500 to 10,000 g/mol, based on the total weight of the viscosity improver monomer composition, b) 50 to 70 % by weight of methyl(meth)acrylate, butyl(meth)acrylate, one monomer having from 8 to 17 carbon atoms selected from a group consisting of styrene or a substituted styrene having an alkyl substituent in the side chain or a mixture thereof, based on the total weight of the viscosity improver monomer composition, c) 1 to 15 % by weight of one monomer selected from linear or branched C 7 -C 30 alkyl(meth)acrylates or a mixture thereof, based on the total weight of the viscosity improver monomer composition, a) 10 to 30 % by weight of one or more polybutadiene-based macromonomer a) having a number-average molecular weight of 500 to 10,000 g/mol, based on the total weight of the viscosity improver monomer composition, b) 50 to 70 % by weight of methyl(meth)acrylate, butyl(meth)acrylate, one monomer having from 8 to 17 carbon atoms selected from a group consisting of styrene or a substituted styrene having an alkyl substituent in the side chain or a mixture thereof, based on the total weight of the viscosity improver monomer composition, c) 1 to 15 % by weight of one monomer selected from linear or branched C 7 -C 30 alkyl(meth)acrylates or a mixture thereof, based on the total weight of the viscosity improver monomer composition, wherein the pour point depressant is a polymer having a weight average molecular weight (Mw) of 10,000 to 60,000 g/mol and obtainable by polymerizing a monomer composition comprising: e) 20 to 35 % by weight of one monomer selected from linear or branched C 1 -C 6 alkyl(meth)acrylate or a mixture thereof, f) 20 to 75 % by weight of one monomer selected from linear or branched C 7 -C 15 alkyl(meth)acrylates, based on the total weight of the monomer composition, g) 5 to 60 % by weight of at least one monomer selected from linear or branched C 16 -C 24 alkyl(meth)acrylates, based on the total weight of the monomer composition, e) 20 to 35 % by weight of one monomer selected from linear or branched C 1 -C 6 alkyl(meth)acrylate or a mixture thereof, f) 20 to 75 % by weight of one monomer selected from linear or branched C 7 -C 15 alkyl(meth)acrylates, based on the total weight of the monomer composition, g) 5 to 60 % by weight of at least one monomer selected from linear or branched C 16 -C 24 alkyl(meth)acrylates, based on the total weight of the monomer composition, wherein the weight ratio of to is 99:1 to 80:20, based on the total solid polymer content of polymers and in the additive composition.