| abstract |
The present invention provides a lubricant composition for an internal combustion engine, comprising a base oil of lubricating viscosity, wherein the base oil comprises an ether base oil of formula (A). here: R a and R b are aliphatic hydrocarbyl groups, which may be the same or different, and at least one of R a and R b is a branched alkyl, alkoxy-substituted alkyl or cycloalkyl-substituted alkyl. Yes, The lubricant composition further comprises at least one amine antioxidant and / or at least one phenolic antioxidant, and the total amount of the amine antioxidant and the phenolic antioxidant in the lubricant composition Is 4.0% by weight or less of the lubricant composition. In some embodiments, the ether base oil has the formula (1). here: R 1 R 2 , R 3 , R 4 , R 5 , and R 6 are as defined herein. The lubricant composition may be used to lubricate the surface of an internal combustion engine and to improve fuel economy performance and / or piston cleanliness performance of an engine and / or vehicle, such as an automobile, associated with the internal combustion engine. it can. [Selection diagram] Fig. 1 |