Abstract: A method for preventing or inhibiting exhaust valve seat recession in a natural gas fueled engine, the method comprising lubricating the engine with a natural gas engine lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity, and (b) an alkali metal-containing detergent, wherein the natural gas engine lubricating oil composition is substantially free of each of any alkaline earth metal-containing detergents and lithium-containing detergents is disclosed.

Abstract: A method for preventing or inhibiting exhaust valve seat recession in a natural gas fueled engine, the method comprising lubricating the engine with a natural gas engine lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity; and (b) an alkali metal-containing detergent, wherein the natural gas engine lubricating oil composition is substantially free of each of any alkaline earth metal-containing detergents and lithium-containing detergents is disclosed.

Abstract: A method for preventing or inhibiting exhaust valve seat recession in a natural gas fueled internal combustion engine is disclosed. The method involves lubricating the engine with a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity, and (b) a minor amount of a natural gas engine oil additive package, wherein the lubricating oil composition is substantially free of each of any zinc compounds and alkaline earth metal salts of a condensation product of an alkylene polyamine, an aldehyde and a substituted phenol.

Abstract: A natural gas engine lubricating oil composition is disclosed which comprises (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives, (c) one or more ashless dispersants, (d) one or more alkaline earth metal salts of an alkyl-substituted hydroxyaromatic carboxylic acid, and (e) one or more antioxidants, wherein the natural gas engine lubricating oil composition 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 alkali metal-containing detergents.

Abstract: A natural gas engine lubricating oil composition is disclosed which comprises (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives, (c) one or more oil soluble overbased alkaline earth metal-containing detergents; and (d) one or more oil soluble neutral alkali metal-containing detergents, wherein the natural gas engine lubricating oil composition contains no more than about 0.03 weight percent of phosphorus, based on the total weight of the natural gas engine lubricating oil composition.

Abstract: A lubricating oil composition is disclosed which comprises (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives other than a zinc dithiophosphate, (c) one or more ashless dispersants, (d) one or more metal-containing detergents, and (e) one or more antioxidants, wherein the lubricating oil composition 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 lubricating oil composition is substantially free of any zinc compounds.

Abstract: A natural gas engine lubricating oil composition is disclosed which comprises (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives, (c) one or more oil soluble overbased alkaline earth metal-containing detergents; and (d) one or more oil soluble neutral alkali metal-containing detergents, wherein the natural gas engine lubricating oil composition contains no more than about 0.03 weight percent of phosphorus, based on the total weight of the natural gas engine lubricating oil composition.

Abstract: The present invention is directed to a crankcase lubricating oil composition for protection of silver bearings in locomotive diesel engines comprising (A) a major amount of an oil of lubricating viscosity, and (B) a silver wear protection additive composition, and (C) one or more detergents. The silver wear protection additive composition of the present invention comprises a mixture of (i) a hydrocarbylamine salt of a di-alkyl di-thiophosphoric acid and (ii) a hydrocarbylamine salt of an alkyl acid phosphate.

Abstract: A natural gas engine lubricating oil composition is disclosed which comprises (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives, (c) one or more ashless dispersants, (d) one or more alkaline earth metal salts of an alkyl-substituted hydroxyaromatic carboxylic acid, and (e) one or more antioxidants, wherein the natural gas engine lubricating oil composition 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 alkali metal-containing detergents.

Abstract: A lubricating oil composition is disclosed which comprises (a) a major amount of an oil of lubricating viscosity, (b) one or more phosphorus-containing anti-wear additives other than a zinc dithiophosphate, (c) one or more ashless dispersants, (d) one or more metal-containing detergents, and (e) one or more antioxidants, wherein the lubricating oil composition 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 lubricating oil composition is substantially free of any zinc compounds.

Abstract: A method for preventing or inhibiting exhaust valve seat recession in a natural gas fueled engine, the method comprising lubricating the engine with a natural gas engine lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity; and (b) an alkali metal-containing detergent, wherein the natural gas engine lubricating oil composition is substantially free of each of any alkaline earth metal-containing detergents and lithium-containing detergents is disclosed.

Abstract: A method for preventing or inhibiting exhaust valve seat recession in a natural gas fueled internal combustion engine is disclosed. The method involves lubricating the engine with a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity, and (b) a minor amount of a natural gas engine oil additive package, wherein the lubricating oil composition is substantially free of each of any zinc compounds and alkaline earth metal salts of a condensation product of an alkylene polyamine, an aldehyde and a substituted phenol.