To provide a gas engine oil capable of maintaining oxidation stability of the gas engine oil having low ash content, used under high-temperature conditions and having ≤1,000 KW power generation capacity over a long period.
The gas engine oil uses (1) a poly-α-olefin and (2) a fatty acid ester as (A) a synthetic lubricating oil base oil and at least following components B to E are contained in the base oil. The component B which is basic calcium salicylate as a metal type cleansing agent has a content of 1,300-2,000 wt. ppm expressed in terms of Ca concentration. The component C which is a zinc dialkyldithiphosphate as an agent for preventing abrasion has a content of 400-1,000 wt. ppm expressed in terms of P concentration. The component D which is non-metallic antioxidant has a content of 0.1-5 wt.%. The component E which is a bis type succinic acid imide or its derivative as a dispersing agent has a content of 500-1,500 wt. ppm expressed in terms of N concentration.
NAKAMURA HIDEKI
HAYASHI HIDEKAZU
TOKUDA KAZUTO
KATO MARIKO
COSMO SEKIYU LUBRICANTS KK