<b>Ultra1Plus SAE 75W-90 Synthetic Gear Oil, API GL-4</b> is formulated with synthetic base oils and specialty performance additives to provide improved high-temperature thermal and oxidative stability in a wide range of operating conditions.Specialty anti-scuffing additives and friction modifiers provide advanced protection and lubricity in extreme pressure conditions. Additionally, <br><br>Ultra1Plus SAE 75W-90 Synthetic Gear Oil, API GL-4 is highly shear stable while also resisting rust, oxidation, foaming, and varnish.<br><br> Ultra1Plus SAE 75W-90 Synthetic Gear Oil, API GL-4 is designed for use in all seasons and exceed the year-around, all-weather performance viscosity requirements of SAE J306 as well as the rigorous performance requirements of API GL-4.