Yamalube SAE 90, 80W90 Marine Gearcase Lubricant The Yamalube is a quality gearcase lube for marine environments and optimal performance. The formula features both rust and corrosion inhibitors that help protect bearings internal components from the harsh ware of saltwater environments. A high viscosity extreme pressure design protects gears in high load high speed conditions for extended periods of operation. Recommended for all Yamaha Outboards except for V8, V6 VMAX SHO, and V6 Offshore Mod