LUBRICANT COMPOSITION FOR TRANSMISSION

摘要

Lubricating oil compositions for transmissions comprises (A) a lubricating base oil with a kinematic viscosity at 100°C adjusted to 1.5 to 6 mm 2 /s, composed of (A1) a lubricating base oil with a kinematic viscosity at 100°C of 1.5 mm 2 /s or higher and lower than 7 mm 2 /s or (A1) the lubricating oil and (A2) a lubricating base oil with a kinematic viscosity at 100°C of 7 to 50 mm 2 /s, blended with (B) a poly(meth)acrylate-based additive, so that the composition has a kinematic viscosity at 100°c of 3 to 8 mm 2 /s and a viscosity index of 95 to 200, (A) and (B) fulfill a specific requirement. The compositions achieve long fatigue life though having low viscosity.