| abstract |
The present invention addresses the problem of providing a lubricating oil having both extremely excellent shear stability and low-temperature viscosity characteristics, from the viewpoint of fuel economy and energy saving in automobiles and industrial machines. The lubricating oil composition of the present invention contains: a lubricant base oil (A) having a kinematic viscosity of 1 to 10mm at 100 ℃ 2 And an ethylene- α -olefin copolymer (B), wherein the ethylene- α -olefin copolymer (B) has the following characteristics (B1) to (B4), (B1) the peak top molecular weight is 3,000 to 10,000, (B2) the melt peak is not shown, (B3) the B value is 1.1 or more, and (B4) the kinematic viscosity at 100 ℃ is 140 to 500mm 2 (s) the kinematic viscosity of the lubricating oil composition at 100 ℃ is 20mm 2 The lubricating oil composition has a peak top within a molecular weight range of 3,000 to 10,000, and the weight fraction of a component having a molecular weight of 20,000 or more in a component having a high molecular weight of 3,000 to 10,000 forming the peak top is 1 to 10%. |