Mercury 8M0173230 Automatic Transmission Fluid - 1 GalEngineered for harsh marine environments. Specifically formulated and recommended for use in Mercury Outboards, MerCruiser Inboards, and Tow Sport transmissions requiring DexronIII fluid. Meets Dexron III requirements; Enhanced friction durability for smooth transmission performance; Low viscosity formula for greater fuel efficiency; Resists breakdown from heat, and loss of proper lubricity; Engineered to withstand the rigorous demands of the marine environment; Enhanced oxidation and corrosion protection of internal components;