Patent ID: 9593292
Date: 2017-03-14
CPC Classifications: C10M,C10N

Claim:
1. A method for lubricating a sump-lubricated, internal combustion stationary gas engine that is fueled by natural gas, wherein the engine drives a compressor and wherein both the engine and the compressor are lubricated with the same lubricant, comprising supplying to said engine a lubricant comprising: (a) an oil of lubricating viscosity; (b) about 0.02 to about 0.08 percent by weight a polyether, a polyetheramine, or mixtures thereof, of number average molecular weight about 1000 to about 10,000; said polyether, polyetheramine, or mixtures thereof comprising alkylene oxide monomer units, where the alkylene group contains 3 to 6 carbon atoms, and ethylene oxide monomer units; (c) about 10 to about 300 parts per million by weight of one or more anti-foam agents, provided that the amount of silicon-containing antifoam agents is less than about 70 parts per million by weight; and (g) about 0.5 to about 5 percent by weight of a metal-containing detergent;