| abstract |
In addition to the properties of conventional cylinder lubricating oil compositions, a cylinder lubricating oil composition for crosshead diesel engines is disclosed, which has improved oxidation stability and scuffing properties. This cylinder lubricating oil composition comprises (A) an alkaline earth metal phenate of at least 0.005 mol / kg based on phenate soap content, based on the total mass of the composition in base oils having an aromatic component of at least 8.5 mass%, and (B) 0.1 to 5 mass% of amines. It contains an antioxidant and (C) an oil soluble molybdenum compound of 30 to 500 mass ppm based on the element of molybdenum, and has a base value of 20 to 100 mg OH / g and a 100 ° C kinematic viscosity of 12.6 mm 2 / s or more. |