Patent ID: 8853138

Claim:
A gear oil composition, comprising: a. a major amount of a mineral oil having an oil kinematic viscosity at 100° C. from 3 to 120 mm 2 /s and a viscosity index of at least 60, wherein the mineral oil comprises less than 5 wt % of a heavy fraction; b. a polybutene in an amount from greater than 10 wt % to 25 wt %, based on a total weight of the gear oil composition; c. 0.1 to 0.5 wt % of carbon black, based on the total weight of the gear oil composition, wherein the carbon black consists of unit particles of amorphous carbon with the unit particles linking together into chains; d. 0.001 to 30 wt % of at least one additive selected from dispersants, detergents, antifoaming agents, antioxidants, rust inhibitors, metal passivators, extreme pressure agents, friction modifiers, and mixtures thereof, based on the total weight of the gear oil composition.