| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricating oil composition for internal combustion engines having excellent high-temperature detergency and maintaining characteristics thereof though with a low ash content, especially suitable for the internal combustion engines equipped with an exhaust gas after-treatment apparatus. SOLUTION: The lubricating oil composition for the internal combustion engines comprises (A) a hindered amine detergent which is a 2,2,6,6- tetraalkylpiperidine derivative having a substituent at the 4-position in an amount of 0.005-0.2 mass% expressed in terms of nitrogen element based on the total amount of the composition and (b) a polybutenylsuccinimide and/or a derivative thereof in an amount of 0.05-0.4 mass% expressed in terms of the nitrogen element based on the total amount of the composition in a base oil composed of a mineral oil and/or a synthetic oil. The content ratio of the components (A) and (B) is such that the mass ratio ([H]/[S]) of the nitrogen content ([H]) based on the component (A) to the nitrogen content ([S]) based on the component (B) is≤2. COPYRIGHT: (C)2004,JPO |
