| abstract |
A lubricating oil composition, particularly suitable for use in steam turbines or gas turbines, is disclosed. The turbine oil composition comprises a major amount of a mineral or synthetic hydrocarbon base oil and an effective amount of a combination of the following materials: triphenyl phosphite or a trialkylsubstituted phenyl phosphite; diphenylamine or alkylated diphenylamine; phenyl Alpha -naphthylamine, phenyl Beta naphthylamine, alkyl or alkaryl substituted phenyl Alpha naphthylamine, or alkyl or alkaryl substituted phenyl Beta naphthylamine; benzotriazole or alkyl-substituted benzotriazole; partial ester of alkyl or alkenyl succinic anhydride. In a preferred aspect, the turbine oil composition contains additionally an effective amount of a copolymer of N-vinyl-2pyrrolidone and an Alpha -olefin. |