Safeguards boat transmissions from water damage Transmission fluids designed for marine engine protection are specifically formulated to safeguard boat transmissions from the unique challenges of aquatic environments. These fluids typically offer superior water separation properties, preventing emulsification that can lead to transmission damage. They often feature enhanced corrosion inhibitors to protect against salt water exposure. Marine engine protection fluids usually have excellent thermal stability to maintain performance under varying temperature conditions encountered on water. Using the right fluid is crucial for preventing water ingress, reducing wear, and ensuring reliable operation of marine transmissions, ultimately extending the life of boat engines and drive systems.