. . "The oil composition of claim 1 also containing at least one additional metal salt of a dihydrocarbyl dithiophosphoric acid characterized by Formula IX ##STR14## wherein R1 and R2 are hydrocarbyl groups containing from 3 to about 10 carbon atoms, M is a Group I metal, a Group II metal, aluminum, tin, iron, cobalt, lead, molybdenum, manganese, nickel or copper, and n is an integer equal to the valen" . . .