| abstract |
A lubricating oil additive for lubricating compositions is disclosed. The composition is essentially comprised of a lubricating base oil having dissolved therein a combination of: (A) a metal salt of a dihydrocarbylphosphorodithioic acid of formula (I), wherein at least one of the hydrocarbyl groups R is a neohydrocarbyl group of formula (II), wherein R1, R2 and R3 are hydrocarbyl groups selected from the groups consisting of aliphatic or aromatic groups; (B) a metal overbased composition; and (C) a reaction product of a composition prepared by reacting (i) a hydrocarbon substituted succinic acid producing compound with at least about one-half equivalent, per equivalent of acid producing compound with (ii) one or more amines, one or more alcohols, or a mixture of one or more amines and/or one or more alcohols. |