LUBRICATING OIL COMPOSITION

摘要

A lubricating oil composition comprising a base oil which contains in the base oil a boron-modified polybutenyl succinic mono- and/or di-imide compound and an aromatic amine compound, and which has an oxidation induction time according to PDSC (pressure differential scanning calorimetry) of not less than 65 minutes and an evaluation score of not less than 6.0 in a hot-tube test at 2900C. The lubricating oil composition is suitable for use as a long life engine oil which improves markedly the anti-oxidation properties of the lubricating oils of gasoline engines and diesel engines.