Peak 75W140 Gear Oil is a full synthetic oil that provides exceptional protection under severe operating conditions. It is recommended for use in limited slip differentials, manual transmissions and final drives. It can also be used in gear cases in cars as well as axles of heavy duty trucks and off road equipment. This product has additives that include anti-weld, anti-scuff and anti-wear properties. It exceeds the latest requirements of gear and transmission manufacturers requiring API GL-5 or API MT-1 lubricants.