The Marine 4T is a semi-synthetic based 4-stroke engine oil specifically formulated for Personal Watercraft, Outboards, Inboards and Stern Drives. The unique frictional profile of this product optimizes supercharger performance (more power) while protecting the internal supercharger components. The shear-stable polymer system provides excellent film thickness and viscosity stability across all operating temperatures. Advanced, proprietary additive system with extremely robust anti-corrosion and anti-wear protection keeps your engine running clean, trouble-free and extends the life of the machine.