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Star brite Pro Star Super Premium Synthetic Blend 4 Stroke 10W30 Outboard Oil meets or exceeds all criteria for viscosity, filter plugging, foaming, and aeration. The synthetic/organic blend produces excellent low-temperature properties for quick stops and has sheer-stable polymer additives plus synthetic base stocks maintain proper viscosity under extremely harsh marine conditions. Designed for 4 stroke high-performance outboards, gasoline inboards, and stern drives.