| abstract |
An additive free of phosphorus and sulfur suitable for use as an anti-wear additive in lubricating oil compositions. A lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity, and (b) an oil-soluble epoxide compound having the following structure, provided that the oil of lubricating viscosity does not contain a carboxylic acid ester. (Wherein, X is a hydrogen or a substituted or unsubstituted C 1 -C 20 hydrocarbon group, substituted hydrocarbon group, a substituted hydroxyl group, an alkoxy group, one or more selected from an ester group or an amino group And Y is —CH 2 OR, —C (═O) OR 1 or —C (═O) NHR 2 , wherein R, R 1 and R 2 are independently hydrogen or C 1 -C 20 alkyl or alkenyl group) [Selection figure] None |