Quicksilver 25W-40 4-Stroke Inboard & Sterndrive Marine Engine Oil

Quicksilver 25W-40 Inboard & Sterndrive oil is formulated to meet the heavy demands of inboard marine engines operating in harsh conditions. This mineral oil provides dependable lubrication during long hours of cruising as well as protection during periods of winter inactivity. Its advanced formula keeps viscosity stable even during prolonged high-RPM runs, safeguarding vital components from overheating, wear, and corrosion. Whether you’re maintaining a motor yacht, a fishing boat, or a work vessel, this oil will help extend engine life and reduce the need for frequent maintenance.

• Built for Hard Use: Ideal for vessels like cruising yachts, powerboats, and workboats whose inboard engines frequently endure high stress. The oil maintains its lubricating properties even when the engine is pushed to its limits for extended periods.
• Protection During Storage: During winterization or long lay-ups, the oil leaves a protective film on internal metal surfaces, preventing rust and oxidation. This means the engine’s internals are shielded from corrosion during months of non-use.
• Keeps Engine Clean: A robust detergent additive package keeps pistons, valves, and rings clean. It prevents ring sticking and sludge formation, which helps the engine remain responsive and fuel-efficient over time.
• Meets High Standards: Meets or exceeds API SG/CD requirements, indicating compatibility with the specifications of older as well as many newer engines. This ensures the oil provides the necessary protection for gasoline engines and even some diesel engines where applicable.
• Trusted by Professionals: Quicksilver 25W-40 is a favorite among marine mechanics. They choose it for its ability to prolong engine life, deliver smoother operation, and ensure reliability on every trip. Your engine will run with confidence on this oil, even when facing tough marine challenges.