| abstract |
A lubricating oil composition having a high density and a high viscosity index and an apparatus using the same are provided. A lubricating oil composition is obtained by blending a compound (C) with a base oil containing the following compounds (A) and (B), and has a kinematic viscosity at 40 ° C. of 20 mm 2 / s or more and 40 mm 2 / s or less, 15 ° C. density is 1.1 g / cm 3 or more, flash point is 200 ° C. or more, and viscosity index is 100 or more. (A) An ester or ether having two or more aromatic rings (B) An ester or ether having a 40 ° C. kinematic viscosity of 12 mm 2 / s or less and a 15 ° C. density of 0.9 g / cm 3 or more And a compound having a flash point of 100 ° C. or higher (C) Poly (meth) acrylate having a weight average molecular weight of 50,000 or less [Selection] None |