Patent ID: 8476209
Filing Date: 2013-07-02
Classification: C10M,C10N

Abstract:
1. A method for lubricating a spark ignited, turbo-charged, sump-lubricated internal combustion engine with a lubricant, wherein the lubricant encounters a temperature within the turbocharger of at least 300° C., wherein said lubricant is contaminated with liquid fuel and wherein the lubricant is subject to deterioration as revealed by the formation of granular sediment, said method comprising providing said engine with a lubricant which contains an amount of an aminic antioxidant effective to reduce the formation of said granular sediment, said amount being at least about 0.5 percent by weight of the lubricant, and wherein the lubricant contains less than about 2 percent by weight of a hindered phenolic antioxidant; wherein the engine is fueled with a gasoline which comprises greater than about 5 percent by weight of aromatic materials having one or more hydrocarbyl substituents totaling 3 or more carbon atoms.