| abstract |
The present invention provides a lubricating oil composition comprising: (a) a major amount of lubricating oil, (b) a diarylamine antioxidant, and (c) an amidine compound of formula ( I ), wherein R1 is hydrogen , an alkyl or aromatic group containing 1-30 carbon atoms; x is 1 to 5; Y is an optional linking alkyl group; Z is carbon or nitrogen; and R 2 is hydrogen or contains 1-30 carbons atom of the alkyl group. Also provided is a method for lubricating an engine, comprising lubricating the engine with the lubricating oil composition |