ENGINE PROTECTION AT HIGH RPMs - Specially formulated with shear-stable polymer additives and synthetic base stocks for maximum engine protection under high stress and RPMs QUICKER STARTS IN COLD WEATHER - Synthetic/organic blend ensures exceptional low-temperature properties, allowing for quicker and more reliable engine starts in harsh marine environments NMMA FC-W CERTIFIED - Meets or exceeds the stringent requirements of the NMMA FC-W certification, designed specifically for 4-stroke outboard motors, ensuring top-tier performance ADVANCED ENGINE CLEANLINESS - Additive package optimizes engine cleanliness, effectively preventing sludge and deposit buildup for a smoother, more efficient engine operation EXCEEDS OEM SPECIFICATIONS - Surpasses the most demanding OEM requirements and surpasses API requirements for SJ, CF-4 and CH-4 ensuring your engine's warranty remains intact SUPERIOR VISCOSITY CONTROL - Maintains proper viscosity in extreme marine conditions, ensuring consistent engine protection and performance HIGH-PERFORMANCE FORMULA - Ideal for high-performance outboards, gasoline inboards, and stern drives, providing unmatched protection and efficiency PREVENTS SLUDGE BUILD-UP - Advanced formula prevents sludge and varnish build-up, keeping your engine running cleaner and longer OPTIMIZED FOR MARINE ENGINES - Specifically designed to meet the harsh demand saltwater & freshwater environments, offering superior protection against wear and corrosion PROUDLY AMERICAN, TRUSTED GLOBALLY - Star brite, a leader in marine, auto, RV, and home care since 1973, made in the USA for unmatched quality