| abstract |
The present invention provides a lubricating oil composition for a transmission that is excellent in wear resistance, seizure resistance, and seal material compatibility while improving fuel economy. (A) Mineral oil having a kinematic viscosity at 100 ° C. of 2.0 mm 2 / s to 3.8 mm 2 / s,% CP of 60 to 85,% CN of 15 to 40 and% CA of 3 or less. (B) Phosphite in the base base oil is 200 to 600 ppm by mass in terms of phosphorus element, (C) Alkali metal and / or alkaline earth metal detergent is in the range of 50 to 200 ppm by mass in terms of metal element, ( D) Lubricating oil for transmission, containing 20 to 120 ppm by mass of boron-containing ashless dispersant in terms of boron element, and having a kinematic viscosity at 100 ° C. of 2.5 mm 2 / s to 4.3 mm 2 / s Composition. [Selection figure] None |