Provided is a lubricant composition containing a lubricant base oil and 0.5 to 10 mass% of (A) an ethylene/α-olefin copolymer having a number average molecular weight of 2, 800 to 8, 000, in which the lubricant base oil used here has a kinematic viscosity at 100°C of 1.5 to 40 mm2/s, a viscosity index of 100 or more, a pour point of -25°C or lower, and a sulfur content of 0.01 mass% or less, and the lubricant composition has low viscosity and a long metal fatigue life, while being excellent in low-temperature fluidity and oxidation stability, thereby being particularly suitable as a lubricant for automobile transmissions or the like.
本发明提供了一种润滑油组合物,该组合物含有润滑油基础油和 0.5 至 10 质量%的 (A)
乙烯/α-烯烃共聚物,其平均分子量为 2,800 至 8,000,其中所用的润滑油基础油在 100°C 时的运动粘度为 1.5 至 40 mm2/s,粘度指数为 100 或以上,倾点为 -25°C 或更低,
硫含量为 0.01 质量%或更低。5 至 40 mm2/s,粘度指数为 100 或更高,倾点为 -25°C 或更低,
硫含量为 0.01 质量%或更低,并且该润滑油组合物具有低粘度和较长的
金属疲劳寿命,同时具有优异的低温流动性和氧化稳定性,因此特别适合用作汽车变速器或类似设备的润滑油。