| abstract |
(57) [Problem] To provide a lubricating oil composition capable of efficiently maintaining the cleanliness of an internal combustion engine in order to maintain the performance and expected life of the crankcase of the engine. SOLUTION: (A) an oil having a large amount of lubricating viscosity, wherein the oil has a Group III basestock content of 35% by mass or less, in which the sulfur content is up to 0.03% by mass. Yes, a viscosity index of 120 or more, and a saturate content of 90% by mass or more, and (B) a small amount of an additive composition containing (i) a detergent composition and (ii) other additives. A heavy duty diesel engine lubricating oil composition comprising: ASTM D26 A cold cranking simulated viscosity measured according to J. 02 at -25 ° C of less than 7000 mPa.s; And an oil composition wherein the sulfated ash content measured according to ASTM D874 is less than 1.35% by weight based on the weight of the oil composition. |