LOW ASH LUBRICANT COMPOSITIONS CONTAINING MULTIPLE OVERBASED MATERIALS AND MULTIPLE ANTIOXIDANTS

摘要

A low sulfate ash lubricating oil composition comprising an oil of lubricating viscosity, 0.1 to 3.0% of a calcium overbased acidic material, 0.1 to 2.0% of a magnesium overbased acidic material, and at least 0.5% of a combination of an alkylene-coupled hindered phenol antioxidant and an antioxidant other than an alkylene-coupled hindered phenol antioxidant, is particularly useful for lubricating stationary gas engines.