Patent ID: 8399392

Claim:
A method of reducing asphaltene precipitation (black paint) in an engine, the method including the step of lubricating the engine with a lubricating oil composition comprising, or made by admixing: (A) an oil of lubricating viscosity in a major amount; and (B) a salicylate detergent system in a minor amount comprising one or more neutral or overbased alkaline earth metal C 22 hydrocarbyl substituted salicylates; with the proviso that the salicylate detergent system does not include an alkali metal salicylate; wherein the number of moles of the one or more neutral or overbased alkaline earth metal C 22 hydrocarbyl substituted salicylates in the salicylate detergent system exceeds the number of moles of each of any other one or more neutral or overbased alkaline earth metal hydrocarbyl substituted salicylates present in the salicylate detergent system.