Patent ID: 8178478

Claim:
An internal combustion engine crankcase lubricating oil composition comprising: (A) a crankcase base oil of lubricating viscosity, in a major amount; and (B) the following additives, in respective minor amounts: (B1) a metal detergent system comprising one or more metal salts of one or more acidic organic compounds, which system has a metal ratio of no greater than 3, and which system constitutes the only metal detergent system in the lubricating oil composition; (B2) at least one organic ashless friction modifier; (B3) at least one oil-soluble molybdenum compound; and (B4) at least one metal dihydrocarbyl dithiophosphate, wherein the crankcase lubricating oil composition has a total base number, as measured according to ASTM D-2896, of no greater than 6.