| 摘要 |
The present invention provides a lubricating oil composition comprising 97 to 60% by weight of mineral oil and 3 to 40% by weight of polyester, said mineral oil having a kinematic viscosity of 100 DEG C. of 2 to 50 centistokes, a pour point (as determined by JIS K-2269) of not more than -30 DEG C., and a viscosity index (as determined by JIS K-2283) of not less than 70. This lubricating oil composition is suitably, used for lubrication of parts including a wet brake and a wet clutch, such as automatic transmissions and tractors. The lubricating oil composition of the present invention has a suitable viscosity at high temperatures and further is low in low temperature viscosity. Furthermore the lubricating oil composition of the present invention is excellent in friction characteristics, oxidation stability and also in seal rubber compatibility.
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