| abstract |
The present invention provides a cylinder lubricating oil composition for a crosshead type diesel engine having improved oxidation stability and scuffing resistance in addition to conventional performance. In a base oil having an aromatic content of 8.5% by mass or more, based on the total amount of the composition, (A) alkaline earth metal phenate is added in an amount of 0.005 mol / kg or more as a phenate soap. (B) 0.1 to 5% by mass of an amine-based antioxidant, and (C) 30 to 500 ppm by mass of an oil-soluble molybdenum compound in terms of molybdenum element, and the base number of the composition is 20 to 100 mgKOH / g, A cylinder lubricating oil composition for a crosshead type diesel engine, having a kinematic viscosity at 100 ° C. of 12.6 mm 2 / s or more. [Selection figure] None |