We designed our high-performance Bass Pro Shops Lower-Unit Gear Lube specifically for the marine environment to provide maximum protection against corrosion and excessive wear. This high-viscosity 80W-90 formula meets the requirements of all major brands and works perfectly in stern-drive gear cases as well as outboard-motor lower units that require SAE 80W-90 quality gear oil. Our unique blend in Bass Pro Shops Lower-Unit Gear Lube includes advanced emulsifiers and additives to protect against water intrusion and water, as well as improved lubrication to optimize engine performance. High-viscosity 80W-90 formula GL-5 Formula Maximum protection against corrosion and excessive wear Protects against water intrusion Safe for use in outboard and stern-drive lower units