Royal Purple Motor Oil delivers superior protection and improves performance in both gasoline and diesel marine engines. Whether your watercraft is two-cycle or four-cycle, Royal Purple increases horsepower, saves fuel and reduces heat, wear and emissions. Royal Purple’s unsurpased oxidation stability allows for extended oil drains and fewer oil changes. This saves you time and money and reduces the impact on the environment.

Royal Purple’s performance advantages come from a blend of synthetic oils plus Royal Purple’s proprietary Synerlec technology. Royal Purple Motor Oil is compatible with other mineral and synthetic marine motor oils.