A METHOD OF REDUCING ASPHALTENE PRECIPITATION IN AN ENGINE

摘要

A method of reducing asphaltene precipitation or `black paint' in an engine is disclosed. The method includes the step of lubricating the engine with a lubricating oil composition comprising: an oil of lubricating viscosity in a major amount; and, a salicylate detergent system in a minor amount comprising one or more neutral or overbased alkaline earth metal C22hydrocarbyl substituted salicylates. (No Fig.)