olyamino compound having one primary or secondary amino group and at least one tertiary amino or heterocyclic amino group; (B-2) a minor pour point depressing amount of at least one oil-soluble acrylate polyerization product of at least one ester of the formula: CH2 ═C(X)--COOR wherein X is hydrogen or an alkyl or aryl group, and R is a monovalent hydrocarbyl group containing at least four c