Specially formulated for marine 4-cycle outboard engines. Provides protection against engine rust (in both fresh and salt water), wear and friction, temperature changes and the corrosive effects of diluted fuel. Offers protection for marine engines that goes well beyond oil made for car engines. Assures lubrication of critical bearings during high-RPM operation. The only aftermarket 4-Cycle oil approved by the National Marine Manufacturers Association (NMMA), meeting their FC-W specifications.