The present invention provides a lubricating oil composition for internal combustion engine, which especially exhibits excellent high-temperature detergency and ensures effective functioning of the metallic detergent contained therein even under a condition where moisture is mixed and accumulated therein; in particular, the present invention provides a lubricating oil composition which is suitably used for internal combustion engine of a hybrid vehicle. The lubricating oil composition for internal combustion engine, which includes: (A1) a lubricant base oil as a main component characterized by kinematic viscosity at 100 degree C being 1 to 8 mm2/s, pour point being -15 degree C or less, aniline point being 100 degree C or more, paraffinic content in saturates being 40 mass % or more, monocyclic naphthenic content being 25 mass % or less, bicyclic to hexacyclic naphthenic content being 35 mass % or less, iodine number being 2 or less, and ratio of tertiary carbon to the total carbon atoms composing the (A1) being 6.3% or more; and which further comprises, to the total mass of the composition: (B) 0.005 to 0.5 mass % of a metallic detergent as metal content; (C1) 0.005 to 0.2 mass % of a boron-containing succinimide ashless dispersant as boron content; and (D) 0.005 to 0.2 mass % of a metal salt of phosphorus-containing acid as phosphorus content.
本发明提供了一种用于内燃机的润滑油组合物,该组合物尤其具有优异的高温清净性,即使在其中混有和积聚
水分的情况下,也能确保其中所含的
金属清净剂有效发挥作用;特别是,本发明提供了一种适用于混合动力汽车内燃机的润滑油组合物。这种用于内燃机的润滑油组合物包括(A1) 一种作为主要成分的润滑油基础油,其特征在于 100 摄氏度时的运动粘度为 1 至 8 mm2/s,倾点为-15 摄氏度或更低,
苯胺点为 100 摄氏度或更高,饱和石蜡含量为 40 质量%或更高、单环环烷含量为 25 质量%或更少,双环到六环环烷含量为 35 质量%或更少,
碘数为 2 或更少,三级碳与构成 (A1) 的总碳原子之比为 6.3% 或以上;在该组合物的总质量中还包括:(B) 0.005 至 0.5 质量百分比的
金属洗涤剂(以
金属含量计);(C1) 0.005 至 0.2 质量百分比的含
硼琥珀
酰亚胺无灰分散剂(以
硼含量计);以及 (D) 0.005 至 0.2 质量百分比的含
磷酸金属盐(以
磷含量计)。