Yamalube ACC-GEARL-UB-QT Marine Lower Unit Gearcase Lube 80W-90, GL-4.Superior Marine Lubricant designed to protect gearcase components operating at high speeds for extended periods in fresh or saltwater applications, includes robust rust and corrosion inhibitors for long life. For most Yamaha engines except: Not to be used in V-8 F300 ~ F350, V-6 VMAX SHO 225, 250 and 300 4.2-Liter engines.