| abstract |
(57) [Problem] To provide a viscosity adjusting agent for a lubricating oil and a viscosity adjusting agent capable of obtaining a lubricating oil composition which is excellent in low-temperature characteristics, lubricity at a high temperature, and balance thereof, and hardly undergoes phase separation. Provided is a lubricating oil composition having excellent low-temperature properties. A copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms, the ethylene / α-olefin copolymer (A) having the following characteristics (1) and (2): (1) a density in the range of 857 to 882 kg / m 3 , and (2) a weight average molecular weight in terms of polystyrene of 70,0 measured by gel permeation chromatography. Be in the range of 00 to 130,000. |