| abstract |
An object of the present invention is to provide a lubricating oil composition for a gas engine that is excellent in wear resistance, seizure resistance, corrosion resistance, and evaporation resistance, greatly extends the lubricating oil replacement period, and is economically advantageous. In a lubricating oil composition for gas engines, (A) a metal salt of a specific phosphorus-containing compound having a primary hydrocarbon group is added to a mineral oil and / or a synthetic base oil in an amount of 0.005 to 0.2. % By weight (converted to phosphorus concentration), (B) 0.01 to 0.5% by weight (converted to metal concentration) of a metal detergent selected from alkaline earth metal salicylates and alkaline earth metal phenates, The kinematic viscosity at 100 ° C. is 13 to 27 mm 2 / s, and the NOACK evaporation is 5% by mass or less. [Selection figure] None |