Patent ID: 8361941

Claim:
A lubricating composition comprising: (a) an oil of lubricating viscosity; (b) a sulphur-free amine salt of either (i) a hydroxy-substituted di-ester of phosphoric acid, or (ii) a phosphorylated hydroxy-substituted di- or tri-ester of phosphoric acid; and (c) an organo-sulphide, wherein the sulphur-free amine salt is represented by Formula (1a): wherein A and A′ are independently H, or a hydrocarbyl group containing 1 to about 30 carbon atoms, wherein at least one of A and A′ is a hydrocarbyl group; each R and R″ group are independently a hydrocarbyl group; each R′ is independently R, H, or a hydroxyalkyl group; Y is independently R′, or a group represented by RO(R′O)P(O)—CH(A′)CH(A)-; x is 1; and m and n are both positive non-zero integers, with the proviso that the sum of (m+n) is equal to 4.