Valvoline, QT, 80W90, High Performance Gear Lube, Exceeds The Requirements Of Ford M2C108-C, MIL-L-2105D & Mack GO-H, API GL-5, GL-4 Approved, Recommended For Hypoid & Toher Gears In Automobile, Truck, & Off-Highway Vehicles, Can Be Used In Manual & In Both Regular & Limited-Slip Differentials, Approved & Recommended For Marine Use, Ideal For Modern Outboard & Stern Drive Lower Units, Meets Or Exceeds API-MT-1 & GL-5 Ratings, Will Not Void Manufacturers Warranties.