| 摘要 |
PROBLEM TO BE SOLVED: To provide a lubricant composition for medium-speed trunk piston diesel engines, the lubricant composition being capable of reducing fuel consumption.SOLUTION: A lubricant composition for medium-speed trunk piston diesel engines comprises: as a base oil for the lubricant, one or more selected from the group consisting of a mineral oil and a synthetic oil having a dynamic viscosity at 100°C of 3 mm/s or more and less than 6 mm/s, a mineral oil and a synthetic oil having a dynamic viscosity at 100°C of 6 mm/s or more and less than 9 mm/s and a mineral oil and a synthetic oil having a dynamic viscosity at 100°C of 9 mm/s or more and less than 13 mm/s; and, as a metal-based detergent, calcium salicylate detergents, or the combination of the calcium salicylate detergents with a calcium phenate detergent. The lubricant composition has a dynamic viscosity at 100°C of 7.0-11.0 mm/s or less and a high shear viscosity at 70°C of 7.0-20.0 mPa s, and has a base number determined by the perchloric acid method of 7-55 mgKOH/g. |
