Patent ID: 6727208
Filing Date: 2004-04-27
Classification: C10M,C10N

Abstract:
A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and an additive system comprising(A) from about 0.1 about 5% by weight of a detergent composition comprising at least two metal overbased compositions wherein said detergent composition consists essentially of (A-1) at least one alkali metal overbased sulfonate detergent having a metal ratio of at least about 10:1, and (A-2) at least one calcium overbased sulfonate detergent having a metal ratio of at least about 10:1, wherein the ratio of total base number on a per 100 TBN and diluent-free basis contributed by the alkali metal salfonate detergent to the total base number contributed by the calcium sulfonate detergent ranges from about (99.5-20) to about (0.5-80): (B) from about 1 to about 10% by weight of a succinimide dispersant; and (C) from about 0.1 to about 5% by weight of a metal dihydrocarbyl dithiophosphate of the formula wherein R1 and R2 are each, independently, hydrocarbyl groups containing from 3 to 13 carbon atoms. M is a metal and n is an integer equal to the valence of M.