| abstract |
The present invention provides a gear oil composition for vehicle driving systems, more specifically a gear oil composition for vehicle final reduction gears, which can improve a fuel-saving effect by reducing its viscosity and, at the same time, secure bearing fatigue life characteristics. The gear oil composition comprises a base oil (A) and another base oil (B), described below, and at least one species of additive for gear oil, and has a kinematic viscosity of 80 mm2/s or less at 40°C: (A): a mineral-based oil and/or hydrocarbon-based synthetic oil having a kinematic viscosity of 3.5 to 7 mm2/s at 100°C, and (B): a mineral-based oil and/or hydrocarbon-based synthetic oil having a kinematic viscosity of 20 to 52 mm2/s at 100°C. |