| abstract |
The present invention provides a lubricating oil composition that is excellent in anti-fatigue properties for metals and load bearing properties while having improved fuel efficiency. The lubricating oil composition comprises (A) one type or a mixture of two or more types of mineral base oil having a 40 °C kinematic viscosity of from 5 to 15 mm 2 /s; and (B) one type or a mixture of two or more types of ester-based base oil having a 40°C kinematic viscosity of from 3 to 25 mm 2 /s and a 0°C kinematic viscosity of from 10 to 130 mm 2 /s, the 40°C kinematic viscosity of the mixed base oil of (A) and (B) being 18 mm 2 /s or lower, the blend ratio of the ester-based base oil being from 0.58 to 80 percent by mass, and the 40°C kinematic viscosity of the composition being from 4 to 23 mm 2 /s. |