Mercury 8M0081916 Marine 405060 HP 4-Stroke EFI Oil Change Kit Mercury 25W-40 Marine Engine Oil features high-tech, advanced anti-wear additives that provide up to 35 better camshaft wear protection. Additionally, this formula offers the highest levels of corrosion and oxidation protection. Designed to maintain engine reliability and performance, tests have shown that Mercury 25W-40 Marine Engine Oil holds its viscosity ratings longer in industry wear-testing than other oils on the market. Mercu