Patent ID: 8030256

Claim:
A lubricating oil composition comprising a lubricating oil in an amount greater than about 85% by weight; an oil-soluble secondary diaryl amine in an amount from about 0.5% by weight to about 1.0% by weight; and at least one oil-soluble organo amine tungstate in an amount sufficient to provide about 20 to 4000 ppm of tungsten in the lubricating composition, wherein the at least one organo amine tungstate is derived from an amine, wherein the amine is: (a) a primary amine of the formula: wherein R 1 , R 2 , and R 3 are independently hydrogen, C 1 -C 25 alkyl, C 2 -C 25 alkyl interrupted by oxygen or sulfur; C 2 -C 24 alkenyl, C 4 -C 15 cycloalkyl which is unsubstituted or substituted by C 1 -C 4 alkyl and/or carboxyl; C 5 -C 15 cycloalkenyl which is unsubstituted or substituted by C 1 -C 4 alkyl and/or carboxyl; C 13 -C 26 polycycloalkyl, C 7 -C 9 phenylalkyl which is unsubstituted or substituted on the phenyl ring by C 1 -C 4 alkyl; —COR 6 , a 5- or 6-membered heterocyclic ring which is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, halogen or carboxyl; a 5- or 6-membered heterocyclic ring which is benzo-fused and is unsubstituted or substituted by C 1 -C 4 alkyl, C 1 -C 4 alkoxy, halogen or carboxyl; (b) a tertiary amine of the formula: wherein R 1 , R 2 , and R 3 are independently each a C 1 to C 36 residue that may optionally contain at least one —O—, —S—, —SO—, —CO2-, —CO—, or —CON— moiety, cycloalkyl of 5 to 12 carbon atoms, aralkyl of 7 to 9 carbon atoms, where the aralkyl is further substituted by alkyl of 1 to 36 carbon atoms.