The present invention provides a cylinder lubricating oil composition for a crosshead-type diesel engine, which is improved in oxidation stability and anti-scuffing properties besides the properties of the conventional cylinder lubricating oil composition and comprises a base oil having an aromatic content of 8.5 percent by mass or more 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 mm2/s or higher.
本发明提供了一种用于十字头式柴油发动机的气缸润滑油组合物,该组合物除了具有传统气缸润滑油组合物的性能外,还在氧化稳定性和抗磨损性能方面有所改进,它包括
芳烃含量为 8.5%(质量百分比)或更高的基础油,以及在组合物总质量的基础上,(A) 一种碱土
金属
酚酸酯,其用量为 0.005摩尔/千克或更高,以
苯甲酸皂含量为基础;(B)
氨基
抗氧化剂,含量为 0.1%至 5%(以质量计);(C) 油溶性
钼化合物,含量为 30 至 500 ppm(以
钼含量为基础),基数为 20 至 100 mgKOH/g,100°C 运动粘度为 12.6 mm2/s 或更高。