Star Brite 10w30 Super Premium Synthetic Blend 4 Stroke Oil Shear-stable polymer additives plus synthetic base stocks maintain proper viscosity under extremely harsh marine conditions Synthetic/organic blend assures excellent low-temperature properties for quicker starts This product exceeds the new NMMA specifications FCW desgined especially for 4 stoke Outboard Motors. Exceeds OEM requirements-will not void engine warranty Surpasses API requirements for SJ, CF-4 and CH-4. Provides maximum protection in severe, high RPM applications. Additive package optimizes engine cleanliness, prevents sludge build up.