Provided is a lubricating oil composition favorable for reducing friction in a sliding mechanism equipped with a piston ring and a liner, in a device having the sliding mechanism. The lubricating oil composition contains a lubricant base oil, (1) a polymethacrylate and/or an olefin copolymer having a mass-average molecular weight of 100,000 to 600,000, and (2) an ester-type ashless friction modifier and/or an amine-type ashless friction modifier, and has a shear viscosity at 150°C of 2.3 mPa· or more and less than 3.7 mPa·s.
本文提供了一种润滑油组合物,该组合物有利于在具有滑动机构的设备中减少装有活塞环和衬垫的滑动机构的摩擦。该润滑油组合物包含润滑油基础油、(1) 聚
甲基丙烯酸酯和/或烯烃共聚物,其质量平均分子量为 100,000 至 600,000,以及 (2)
酯类无灰摩擦改进剂和/或
胺类无灰摩擦改进剂,并且在 150°C 时的剪切粘度为 2.3 mPa- 或以上且小于 3.7 mPa-s。