Quicksilver 8M0078622 4-Stroke Synthetic Marine Engine Oil. Engineered for sterndrive and outboard applications. Formulated to protect against corrosion and excessive wear. Offers outstanding strength and viscosity retention. Designed for use with all 4-stroke marine engines. Exceeds all marine industry 4-stroke oil requirements including FC-W and FC-W catalyst compatible. 25W-40 viscosity. Quart.