Importance

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Abstract

An object of the present invention is to provide a lubricating oil composition that is particularly excellent in viscosity characteristics at a low temperature of −35° C., i.e., the lubricating oil composition inhibiting an increase in low temperature viscosity while securing a viscosity necessary at an elevated temperature, and being excellent in storage stability in a low temperature environment. The present invention relates to a lubricating oil composition including a copolymer (A) and a base oil (B), in which the copolymer (A) satisfies the following requirement (a-1), and the content ratio between the copolymer (A) and the base oil (B) is such that the copolymer (A) is in a range of 0.1 to 50 parts by mass per 100 parts by mass in total of the copolymer (A) and the base oil (B).

(a-1) The copolymer (A) is a copolymer of 4-methyl-1-pentene and an α-olefin having 20 or less carbon atoms excluding 4-methyl-1-pentene, including a constituent unit derived from 4-methyl-1-pentene within a range of 1 mol % or more and less than 30 mol % relative to the total constituent units.

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First Claim