LUBRICATING OIL COMPOSITIONS

摘要

PROBLEM TO BE SOLVED: To provide: automotive crankcase lubricating oil compositions for use in gasoline or diesel internal combustion engines; and the use of additives in the lubricating oil compositions for improving anti-corrosion performance properties in respect of non-ferrous metallic engine components.SOLUTION: There is provided an additive for use in a lubricating oil composition (A) comprising an oil of lubricating viscosity in a major amount. The additive comprises an oil-soluble or oil-dispersible polymeric friction modifier (B) to reduce and/or inhibit corrosion of non-ferrous metal containing engine components during operation of a spark-ignited or compression-ignited internal combustion engine. The oil-soluble or oil-dispersible polymeric friction modifier (B) is the reaction product of only: (i) at least one functionalized polyolefin which is a poly(alkylene) functionalized with at least one diacid or anhydride functional group; (ii) one or more polyalkylene glycols; (iii) one or more polyols; and (iv) one or more monocarboxylic acids.SELECTED DRAWING: None