Lubricating oil compositions

摘要

A lubricating oil composition having a sulphated ash content of less than or equal to 1.2 mass % as determined by ASTM D874 and a phosphorous content of less than or equal to 0.12 mass % as determined by ASTM D5185, which lubricating oil composition comprises or is made by admixing: an oil of lubricating viscosity, in a major amount; an oil-soluble or oil-dispersible polymeric friction modifier as an additive in an effective minor amount; and, at least one oil-soluble or oil-dispersiblemolybdenum compound as an additive in an effective minor amount. The polymeric friction modifier is the reaction product of solely (i) a polyalkylene functionalised with at least one diacid or anhydride functional group, (ii) one or more polyalkylene glycols, e.g. polyethylene or polypropylene glycol, and (iii) one or more monocarboxylic acids.