Star brite(R) Super Premium Synthetic Blend 4 Stroke Oil 10W30 is designed for high performance outboards and meets criteria for iscosity, filter plugging, foaming and aeration. FEATURES: Surpasses API requirements for SJ, CF-4 and CH-4 Premium, synthetic blend engine oil designed for 4 stroke high-performance outboards, gasoline inboards and stern drives Additive package optimizes engine cleanliness, prevents sludge build up, 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 Provides maximum protection in severe, high rpm applications Marine engines typically operate at higher rpms than automotive engines, requiring an oil that is specifically designed and formulated to provide protection under these higher temperature, higher stress circumstances Size: 1 gallon Model: 028100