Experienced boaters grab Mercury® Marine 4-Stroke 25W40 Synthetic Blend Marine Engine Oil. This proven boat oil outperforms automotive oils in marine applications because of its specialized additive package just for marine engines. Continued use of Mercury Marine 4-Stroke 25W40 Synthetic Blend Marine Engine Oil provides the best wear and corrosion protection when operating the engine at maximum output and high temperatures for extended periods of time; maintains peak engine performance and reliability; and eliminate thermal breakdown under extreme RPM, temperatures, and load. Unlike inferior, traditional marine oil, This Mercury marine oil won't damage emissions systems and works great in any marine engine with or without a catalytic converter.
For use in 4-cycle outboard engines
Superior corrosion protection
Most recommended OEM marine engine oil
The best wear and corrosion protection, even with high engine use
Maintains peak engine performance and reliability
Eliminates thermal breakdown under extreme RPM, temperatures, and load
Won't damage emissions systems
Works great in any marine engine with or without a catalytic converter
