Patent ID: 9222054
Filing Date: 2015-12-29
Classification: C10M,C10N

Abstract:
1. A cylinder lubricating oil composition for a crosshead-type diesel engine, comprising: a base oil having an aromatic content of 8.4 percent by mass or more and 40 percent by mass or less, and on the basis of the total mass of the composition (A) an alkaline earth metal phenate in an amount of 0.005 mole/kg or more on the basis of phenate soap content; (B) an aminic antioxidant in an amount of 0.1 to 5 percent by mass; and (C) an oil-soluble molybdenum compound in an amount of 30 to 500 ppm by mass on the basis of molybdenum, and having a base number of 20 to 100 mgKOH/g and a 100° C. kinematic viscosity of 12.6 mm wherein the base oil comprises a bright stock in an amount of 6 percent by mass or more on the basis of the total mass of the base oil and has a % C