Premium synthetic blend motor oil designed for high performance 4-stroke outboards, gasoline inboards and sterndrives Additive package optimizes engine cleanliness, prevents sludge build-up Shear stable polymer additives plus synthetic base oils maintain proper viscosity in extremely harsh marine conditions Synthetic/Organic blend provides excellent low temperature properties for faster starting Provides maximum protection in severe, high RPM applications Marine engines typically run at higher RPM than automotive engines, requiring an oil that is specifically designed and formulated to provide protection at these higher temperatures and higher under stressful conditions Exceeds API requirements for SJ, CF-4 and CH-4