| abstract |
(57) [Summary] [PROBLEMS] To provide a lubricating oil composition for an internal combustion engine, which has a low ash content, does not impair the performance of an exhaust gas aftertreatment device, and is excellent in coking resistance and oxidation stability. [Structure] For a lubricating base oil, (a) a boron-containing ashless dispersant, (b) a metal-based detergent and optionally (c) an ester of an aromatic carboxylic acid having a hydroxyl group and a hydroxy compound, and / or its boron The content is [B] / [M] {[B]: Boron content (% by weight) in the composition, [M]: For an internal combustion engine having a sulfated ash content of 1.5% by weight or less, which is compounded in a proportion that the total metal content (% by weight) based on the metallic detergent in the composition is 0.15 or more. It is a lubricating oil composition. |