Doill Gearmax 75W90 is a fully synthetic manual transmissions oil. It is formulated with top quality, highly refined base oils and an advanced additive system that provides enhanced shifting, all weather performance, and a high level of gear and synchronizer protection. The stability and reliability built into Doill Gearmax 75W-90 makes it the right choice for applications requiring API GL-5 service requiring a SAE 75W-90 viscosity grade.