SYN BLEND 4S O/B OIL 10W-40 32oz

The Star brite Pro Star Super Premium 10W-40 4-Stroke Outboard Oil is formulated specifically designed for high performance 4 stroke outboards, gasoline inboards and stern drives. It's additive package optimizes engine cleanliness and prevents sludge build up, and provides maximum protection in severe, high RPM applications. This oil has shear-stable polymer additives plus synthetic base stocks maintain proper viscosity under extremely harsh marine conditions. It is certified under NMMA's FC-W category and meets/exceeds all criteria for viscosity, filter plugging, foaming and aeration. It also passed NMMA's 100-hour general performance engine test, and surpasses API requirements for SJ, CF-4 and CH-4.