Star Brite 028300 Super Premium Synthetic Blend 4-Stroke Outboard Oil 25W-40 1 Gallon

Star Brite 028300 Super Premium Synthetic Blend 4-Stroke Outboard Motor Oil SAE 25W-40 is a high-performance marine engine oil engineered specifically for demanding freshwater and saltwater environments. Available in a convenient 1-gallon (128 oz) container, this synthetic blend formula delivers outstanding protection for engines that must perform at higher RPMs and under harsher conditions than typical automotive applications.

Formulated for use in 4-stroke high-performance outboards, gasoline inboards, and stern drives, this oil is compatible with leading brands including Honda, Mercury, Yamaha, Nissan, Suzuki, Johnson, and Tohatsu outboard engines.

Key Features:

• NMMA FC-W Certified — One of the first 4-stroke marine oils certified under the NMMA FC-W category; meets or exceeds all criteria for viscosity, filter plugging, foaming, and aeration
• Passes NMMA 100-Hour Engine Test — Successfully completed NMMA's rigorous 100-hour general performance engine test
• Exceeds API Requirements — Surpasses API service categories SJ, SL, SM, CF-4, and CH-4 for superior engine protection
• Shear-Stable Polymer Additives — Combined with synthetic base stocks to maintain proper viscosity under extremely harsh marine operating conditions
• Advanced Engine Cleanliness — Specialized additive package prevents sludge and varnish buildup, keeping internals cleaner longer
• Excellent Cold-Start Performance — Synthetic/organic blend provides enhanced low-temperature properties for quick, reliable starts in any weather
• High-RPM Protection — Engineered to deliver maximum wear protection in severe, high-RPM marine engine applications

Star Brite 028300 25W-40 4-stroke outboard oil is the professional-grade choice for boaters who demand the highest level of engine protection and longevity from their marine power equipment.