As a system lubricating oil for crosshead diesel engines that has excellent high temperature detergency and anti-coking properties with little generation of deposits even when using a base oil with a high saturated hydrocarbon content, the disclosure provides (i) a lubricating oil composition including a base oil (A) with a kinematic viscosity at 100°C of 8.2-12.6 mm2/s and a saturated hydrocarbon content of 90% by mass or more, a metallic detergent (B) and a zinc dithiophosphate (C), wherein a content of the metallic detergent (B) is 2.5 mmol or more as a soap content concentration per 100 g of the composition, a phosphorous content is 200-1000 mass ppm, and a base number is 7.5 mg KOH/g or more, and (ii) a lubricating oil composition including the base oil (A), the metallic detergent (B), the zinc dithiophosphate (C) and an amine-based antioxidant (E), wherein a content of the amine-based antioxidant (E) is 0.3% by mass or more in terms of total content of the composition, a base number is 6.5 mg KOH/g or more, and a phosphorous content is 200-1000 mass ppm.
作为一种用于十字头柴油发动机的系统润滑油,它具有优异的高温清净性和抗结焦性,即使在使用饱和烃含量高的基础油时也很少产生沉积物,本公开提供了 (i) 一种润滑油组合物,包括基础油 (A)、
金属清净剂 (B) 和
二硫代磷酸锌 (C),其中基础油 (A) 在 100°C 时的运动粘度为 8.2-12.6 mm2/s,饱和碳氢化合物含量为 90% 或以上(以质量计)的基础油 (A)、
金属清净剂 (B) 和
二硫代磷酸锌 (C),其中
金属清净剂 (B) 的含量为 2.(ii) 润滑油组合物,包括基础油 (A)、
金属清净剂 (B)、
二硫代磷酸锌 (C) 和
胺类抗氧化剂 (E),其中
胺类抗氧化剂 (E) 的含量为 0.其中胺基
抗氧化剂(E)的含量为组合物总含量的 0.3% 或更高,碱数为 6.5 mg KOH/g 或更高,
磷含量为 200-1000 质量 ppm。