Lubricating oil compositions

摘要

A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of an oil soluble or oil dispersible (a) trinuclear organo molybdenum compound (b) a sulphur compound (c) a phenolic antioxidant and (d) an aminic antioxidant such that the sulphur compound (b) is a hydrocarbyl ester of a thiodicarboxylic acid. Compositions of the present invention show far superior oxidation stability when compared with those which do not contain the combination of antioxidants.