| abstract |
(57) [Abstract] [Purpose] The development of a lubricating oil composition for internal combustion engines, which is suitable for engine maintenance-free systems and which has oxidation stability and sludge resistance, and exhibits excellent cleanliness. [Constitution] A lubricating base oil contains the following components (A) to (D) as specific amounts of essential components based on the total amount of the composition, and the total base number of the composition is 2.0 to 6.0 mg KO. It is characterized in that it is H / g. (A) Specific alkaline earth metal-based detergent, (B) Specific dialkyldithiophosphate represented by general formula (1), (C) Succinimide-based ashless dispersant, and (D) Phenol-based and / Or amine-based ashless antioxidant. |