Patent ID: 6423670
Filing Date: 2002-07-23
Classification: C10M,C10N

Abstract:
A diesel engine lubricating oil composition comprising a major amount of oil of lubricating viscosity to which has been added:(a) a lubricating oil ashless dispersant which has not more than 0.2 mass % boron; (b) an oil-soluble neutral calcium phenate detergent; (c) an oil-soluble overbased calcium or magnesium sulfonate or mixture thereof present in an amount such that not more than 0.05 magnesium is present in the composition; (d) a metal dihydrocarbyldithiophosphate present in an amount such that the phosphorus content of the composition is from 0.025 to 0.10 mass %; and (e) a phenolic or aminic antioxidant in a minor amount the composition being free of neutral metal detergent, other than the phenate (b).