LUBRICATING OIL COMPOSITIONS
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United States of America Patent
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app pub date -
Feb 11, 2015
filing date -
Feb 18, 2009
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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.
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