Patent ID: 7307048

Claim:
A transmission oil composition for an automobile comprising: a base oil consisting essentially of a mineral oil having a kinematic viscosity at 80° C. of 1.5 to 15 mm 2 /s and a viscosity index of 80 or more, and a mineral oil having a kinematic viscosity at 40° C. of 1.0 to 6.0 mm 2 /s, and a phosphate compound selected from the group consisting of (A) a zinc dithiophosphate having a hydrocarbon group, (B) a triaryl phosphate, (C) a triaryl thiophosphate, and mixtures thereof at 0.1 to 15.0% by mass with respect to the total composition, wherein said composition has a volume resistivity of 1×10 7 ohm·m or more at 80° C., and wherein the kinematic viscosity of said composition at 80° C. is 1.5 to 4.0 mm 2 /s.