Polymers adaptable to use as pour point lowering additives for petroleum oils, said polymers comprising as comonomers therein(a) from 10 to 30 mole percent of methyl methacrylate,(b) from 10 to 70 mole percent of alkyl methacrylates having linear alkyl groups with from 16 to 30 carbon atoms in the alkyl group,(c) from 10 to 80 mole percent of alkyl methacrylates having linear alkyl groups with from 4 to 15 carbon atoms in the alkyl group and/or having branched alkyl groups with from 4 to 40 carbon atoms in the alkyl group,(d) from 0 to 30 mole percent of a free-radically polymerizable nitrogen-containing monomer having dispersing action,and petroleum oils containing such polymers as pour point lowering additives.