This product is a genuine Traxxas 1 million weight differential oil designed to dramatically limit differential action for maximum traction and consistent power delivery. The ultra-thick silicone formulation helps reduce diff unloading, making it ideal for high-power setups, speed runs, and aggressive off-road driving. It provides long-lasting viscosity stability under heat and heavy load conditions. This differential oil is compatible with Traxxas vehicles that use oil-filled differentials, including Slash 4x4, Rustler 4x4, Stampede 4x4, Hoss 4x4, Maxx, X-Maxx, and other Traxxas models. It is an essential tuning fluid for dialing in drivetrain performance.