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Z Premium SAE 75W-90 Synthetic Gear Oil, API GL-5 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, Z Premium SAE 75W-90 Synthetic Gear Oil, API GL-5 is highly shear stable while also resisting rust, oxidation, foaming, and varnish.Z Premium SAE 75W-90 Synthetic Gear Oil, API GL-5 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-5.