Patent ID: 8394745

Claim:
A lubricating base oil comprising saturated components of 97% by mass or greater, wherein the proportion of cyclic saturated components among the saturated components is not greater than 40% by mass, an iodine value of not greater than 2.5, wherein the kinematic viscosity at 100° C., the viscosity index and the pour point of the lubricating base oil are in a combination chosen from (a) a kinematic viscosity at 100° C. ranging from 2.0-3.0 mm 2 /s, a viscosity index ranging from 110-135, and a pour point not greater than −15° C., (b) a kinematic viscosity at 100° C. ranging from 3.0-4.5 mm 2 /s, a viscosity index ranging from 135-150, and a pour point not greater than −17.5° C., and (c) a kinematic viscosity at 100° C. ranging from 4.5-20 mm 2 /s, a viscosity index ranging from 110-135, and a pour point not greater than −12.5° C., wherein the mass ratio of monocyclic saturated components and bicyclic or greater saturated components among the cyclic saturated components satisfies the condition represented by the following inequality: M A /M B ≦3 wherein M A represents the mass of monocyclic saturated components and M B represents the mass of bicyclic or greater saturated components.