Patent ID: 8536102

Claim:
A method of reducing yellow metal corrosion in axles and transmissions, said method comprising contacting the metal components of the axle and transmission with a gear oil composition comprising: c) a major amount of a base oil of lubricating viscosity; and (d) a minor amount of a gear oil additive composition comprising: (i) an organic polysulfide containing greater than 50 wt % of a dialkyl polysulfide compound or mixture of dialkyl polysulfide compounds of the formula: R 1 —(S) x —R 2 wherein R 1 and R 2 are independently an alkyl group alkyl of about 4 to 12 carbon atoms and x is 4 or greater; (ii) a thiadiazole; and (iii) at least one ashless phosphorus-containing wear inhibitor compound; wherein component (i) is present at about 0.1 to 3.6 wt. %, wherein component (ii) is present at about 0.01 to 0.6 wt. %, and component (iii) is present at about 0.1 to 2.5 wt. %, all weight percentages base on the total weight of the gear oil composition.