Mercury Marine High Performance Gear Lube 2.5 Gallon 2Pak #92858065K01For use in gear housings of all Mecury, Mariner, and Force outboards. do not mix with Premium gearlube or any other lubricants. (may have an adverse affect on gearlife). Mercury Premium+ gearlube is an exclusive formulation engineered to provide excellent lubrication and corrosion protection to lower unit gears in high or low horsepower engines under varying operating conditions. Contains Improved emulsifiers to help protect gear housins. Tackifiers to improve oil film adhesion to gears and internal components.Additives to protect gears from metal to metal contact and excessive wear. We recommend that you change your gearlube at least once per year or after every 100 hours of operation under normal use. 50 hours for salt water. Keep your engine running longer and stronger with Mercury Precision Parts.