Method for lubricating a compression engine with a lubricant oil comprising polyisobutylene

摘要

A method of lubricating the crankcase of a compression ignition internal combustion engine which method comprises lubricating the crankcase with a monograde lubricating oil composition comprising a major amount of a base oil of lubricating viscosity in which the base oil comprises at least one polyisobutylene polymer as a basestock component. When at least one polyisobutylene polymer is used as a basestock component in the base oil of a monograde lubricating oil composition, the monograde lubricating oil composition exhibits reduced oil consumption when used to lubricate the crankcase of a compression ignition internal combustion engine, for example as compared to a comparable lubricating oil composition which has basestock components in the base oil other than polyisobutylene polymers.