FIELD: chemistry.
SUBSTANCE: lubricating oil composition is provided in the invention, into which a copolymer of certain olefins and alkyl methacrylates is added. The lubricating oil composition comprises (A) 50 to 90 wt % of, at least, one kind of base oil of lubricating oil selected from mineral oils and synthetic oils and (B) 10 to 50 wt % of a copolymer of olefin and alkyl methacrylate having a weight average molecular weight of 1200 to 50,000, the said lubricating oil base oil comprising (C) carboxylic acid ether in an amount of 5 to 15 wt % relative to the total amount of the lubricating oil composition.
EFFECT: excellent anti-seize properties, the formation of a small amount of sediment, and a high viscosity index.
7 cl, 2 tbl, 1 dwg
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