If you routinely change the oil in your ride, using the Mercury oil change kit to change your boat’s engine oil will be a snap. Mercury oil change kits contain industry-leading Mercury 25W-40 Marine Engine Oil. Over five years of engineering and development went into the exclusive Flagship Protection formula, which features a high-tech, advanced set of anti-wear additives that provide up to 33% better camshaft wear protection and the highest levels of corrosion and oxidation protection. Designed to maintain engine reliability and performance, Mercury 25W-40 Marine Engine Oil has been proven to hold its viscosity ratings longer in industry wear testing than other oils on the market. Mercury Oil, combined with a genuine Mercury Oil Filter, team up to provide the #1 protection on the water. The Mercury oil change kit is simple for most DIYers to use or have the oil change performed by a marine technician.