Premium mercury gear lubricant For gearboxes of all Mercury, Mariner and Force outboards. Do not use this product for OMC electric gear housings. Mercury Premium Gear Lubricant is an exclusive formula designed to provide excellent lubrication and corrosion protection for the lower gears of high or low power motors under a variety of conditions. Contains: Improved emulsifiers for gear protection in case of water coming into the box. Slimy agents improving the adhesion of the oil film to gears and internal components. Gear protection additives against metal-to-metal contact and excessive wear. The annual change of lubricant (before wintering) or every 100 hours of operation under normal use (50 hours in seawater) is recommended.