Patent ID: 8034753

Claim:
A lubricating oil composition having a sulfur content of up to 0.3 wt. %, a phosphorus content of up to 0.08 wt. %, a sulfated ash content of up to 0.80 wt. % achieving a piston cleanliness rating meeting the requirements of the ACEA B specification, as measured by an XUD-IIBTE fired engine test and containing less than 5 millimoles of detergent soap per kilogram of oil composition, which composition comprises an admixture of (a) a major amount of an oil of lubricating viscosity; and (b) overbased detergent consisting essentially of overbased alkaline earth metal alkyl salicylate lubricating oil detergent having a salicylate soap content of 20 to 25 wt. % and a 100% active mass TBN of 10-700 mg KOH/g.