ASHLESS LUBRICATING OIL FORMULATIONS FOR NATURAL GAS ENGINES

摘要

The present invention provides an ashless lubricating oil composition that improves the corrosion properties in natural gas engines. The ashless lubricating oil composition comprises: a) a major amount of base oil of lubricating viscosity; b) from about 1 to 6 wt.% of an untreated polyalkylene or polyalkenyl succinimide dispersant; and c) from about 1 to 6 wt.% of a borated polyalkylene or polyalkenyl succinimide dispersant.