Patent ID: 8288326
Filing Date: 2012-10-16
Classification: C10M,C10N

Abstract:
1. A natural gas engine lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives other than a zinc dithiophosphate, wherein the one or more phosphorus-containing anti-wear additives is a mixture containing a hydrocarbyl phosphate and a hydrocarbyl phosphite, (c) one or more ashless dispersants, (d) one or more metal-containing detergents, and (e) one or more antioxidants, wherein the natural gas engine lubricating oil composition has a sulfated ash content of about 0.1 to about 1.25 wt. % as determined by ASTM D 874 and contains no more than about 0.03 weight percent of phosphorus, based on the total weight of the natural gas engine lubricating oil composition, and further wherein the natural gas engine lubricating oil composition is substantially free of any zinc compounds.