Lubrication method of reservoir-lubricated internal combustion engines, lubricant composition, and method of reducing oxidative degradation of a lubricant composition

摘要

The lubricant for an internal combustion engine fueled by a biodiesel fuel (that is, a liquid fuel containing a C1-C4 alkyl ester of a carboxylic acid of about 12 to about 24 carbon atoms) exhibits improved resistance to oxidative degradation when the lubricant contains an alkali metal detergent.