A lubricating oil composition

Abstract

A lubricating oil composition comprising: (A) an oil of lubricating viscosity in a major amount; (B) an oil-soluble polymeric additive component (B) as an additive in a minor amount. The lubricating oil composition exhibits enhanced oxidative stability when used to lubricate a spark-ignited or compression-ignited internal combustion engine which is fuelled with a biofuel.

Description

field of invention [0001] The present invention relates to automotive lubricating oil compositions, more particularly to such lubricating oil compositions for use in gasoline (spark ignition) and diesel (compression ignition) internal combustion engines fueled at least in part with biofuels, in particular at least in part Crankcase lubrication of compression ignition internal combustion engines fueled with biodiesel fuel and spark ignition internal combustion engines at least partially fueled with bioethanol fuel, such compositions are referred to as crankcase lubricants. [0002] In particular, although not exclusively, the present invention relates to automotive lubricating oil compositions, preferably having low levels of phosphorus and low levels of sulfur and / or sulfated ash, which are used as biofuels. A fuel exhibiting improved antioxidant properties during operation of an engine; and to the use of an additive in such compositions for improving the antioxidant propertie...

AI Technical Summary

Problems solved by technology

[0007] Oxidation of lubricants often produces corrosive acids and an undesired increase in viscosity, shortening lubricant life

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