Patent ID: 7964540

Claim:
A composition comprising 1-60% by mass of at least one hydrocarbon compound of any of formulas (a) to (f), wherein in (a)-(t), k, m and n are each an integer of 0 to 6 with the proviso that k+m is an integer of 0 to 6, and wherein R 1 and R 2 each represent an alkyl group having 1 to 4 carbon atoms or a cycloalkyl group having 5 to 12 carbon atoms; and a synthetic traction base oil which is selected from the group consisting of: a hydrocarbon which has 16 to 20 carbon atoms and which is represented by the formula (h): wherein q is an integer of 1 or 2 and r is an integer of 2 or 3, 2,4-dicyclohexyl-2-methylpentane, and 2,3-dicyclohexyl-2,3-dimethylbutane, wherein the composition has a viscosity, at −40° C., of 40 Pa·s or lower, and a viscosity index of 80 or higher.