One of the first 4 stroke oils to be certified under NMMA's new FC-W category. Meets or exceeds all criteria for viscosity, filter plugging, foaming and aeration. Successfully passed NMMA's 100-hour general performance engine test. - Exceeds OEM requirements - Will not void manufacturer's warranty - 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 - Unlike car motors, which have horizontal crankshafts, boat motors have vertical crankshafts. While a car motor is constantly bathed in oil, a boat motor is not. This means that the oil formula must be completely different if optimum motor protection is to be provided. - In saltwater, boat motors often face conditions that are much more difficult than those faced by car motors. The motor oil must therefore meet these special requirements.