MARINE DIESEL ENGINE LUBRICATING OIL COMPOSITION HAVING IMPROVED HIGH TEMPERATURE PERFORMANCE

摘要

A lubricating oil composition containing a base oil of lubricating viscosit y, overbased sulfurized alkylphenate detergent or its calcium salt, an overbase d alkylsulfonate detergent or its calcium salt, an ashless dispersant, and a zinc dialkyldithiophosphate and/or zinc diaryldithiophosphate is described. The lubricating oil composition provides improved heat stability and anti-wear performance in marine diesel engines operated under severe conditions where the cylinder liner temperature may reach 200 to 260.degree.C.