Transmission lubricants containing molybdenum

A method for passing the ZF bearing pitting test, No. 0000 702 232 and passing static friction performance according to Caterpillar TO-4 SEQ 1221 in a transmission for off-road vehicles and/or heavy machinery, comprising lubricating the transmission with a transmission fluid composition comprising:

• greater than 50 wt. % of a base oil of lubricating viscosity;
• a detergent composition comprising one or more branched overbased calcium sulfonate detergent(s), wherein the one or more branched overbased calcium sulfonate detergent(s) is in an amount to provide from about 2000 ppm to about 5000 ppm of calcium to the transmission fluid composition;
• and
• an amount of one or more zinc dialkyl dithiophosphate compound(s) to provide from about 700 ppm to about 1500 ppm of zinc to the transmission fluid composition;
• an amount of one or more molybdenum-containing compound(s) to provide from 30 ppmw to 200 ppmw molybdenum to the transmission fluid composition, wherein all amounts are based on a total weight of the transmission fluid composition and the one or more molybdenum-containing compound(s) is selected from the group consisting of molybdenum dithiocarbamate, molybdenum phosphorodithioate, organomolybdenum complex, and molybdenum dialkyldithiophosphate.