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AMSOIL Formula 4-Stroke® Marine Synthetic Motor Oil is a premium-quality synthetic formulation engineered for the harsh operating conditions of marine environments. It withstands the intense mechanical action of continuous, high-rpm operation to deliver superior viscosity protection. Formula 4-Stroke Marine Synthetic Motor Oil is specially fortified with a heavy treatment of advanced additives that protect motors against wear, rust and deposits. It excels in high-horsepower applications and all-day trolling conditions.
NMMA Certified
Formula 4-Stroke Marine Synthetic Motor Oil is certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboard motors. This high-quality oil demonstrates outstanding performance and meets the NMMA FC-W Catalyst Compatible specification requirements.
Marine engines operate under high loads and rpm for extended periods of time, causing traditional automotive oils to break down and lose viscosity. To ensure protection and long-term durability, the NMMA introduced the FC-W Catalyst Compatible standard, which is backward-compatible with the recognized requirements of the FC-W standard. AMSOIL Formula 4-Stroke Marine Synthetic Motor Oil meets the FC-W and FC-W Catalyst Compatible shear stability requirements, outperforming competitive oils to deliver a superior lubricating film. Formula 4-Stroke Synthetic Oil contains robust anti-wear additives that further reduce wear in metal-to-metal contact regions.
Marine engines are prone to rust, leading to uncontrolled wear and premature engine failure. Good rust protection is not natural to motor oil; it comes only by design. Formula 4-Stroke Marine Synthetic Motor Oil is fortified with a special anti-rust agent, even more than required to pass stringent NMMA FC-W and FC-W Catalyst Compatible anti-rust testing.
AMSOIL Formula 4-Stroke Marine Synthetic Motor Oil is recommended for gasoline-fueled four-stroke outboard, inboard, inboard/outboard (I/O) and personal watercraft motors. Use the appropriate viscosity grade where specified in the following:
Honda®, Mercury®, Yamaha®, Johnson®/Evinrude®, Bombardier/BRP®, Suzuki®, Nissan®, Tohatsu®, OMC®, Volvo Penta®, Mercruiser®, Chevrolet®, Ford®
AMSOIL Formula 4-Stroke Marine Synthetic 10W-40 is recommended for use in place of 25W-40 as specified by Mercury®.
NMMA FC-W Catalyst Compatible • API SM
AMSOIL Formula 4-Stroke Marine Synthetic Motor Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil’s life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.
Aftermarket oil additives are not recommended for use with AMSOIL motor oils.
AMSOIL products are backed by a Limited Liability Warranty. For complete information visit www.amsoil.com/warranty.aspx.
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TYPICAL TECHNICAL PROPERTIES |
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AMSOIL FORMULA 4-STROKE® MARINE SYNTHETIC MOTOR OIL (WCF) |
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| Kinematic Viscosity @ 100°C, cSt (ASTM D445) | 14.1 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D445) | 93.3 |
| Viscosity Index (ASTM D2270) | 155 |
| Pour Point °C (°F) (ASTM D97) | -38 (-36) |
| Flash Point °C (°F) (ASTM D92) | 240 (464) |
| High-Temperature/High-Shear Viscosity (ASTM D5481) | 4.2 |
| Four Ball Wear Test (ASTM D4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm) | 0.40 |
| Noack Volatility, % weight loss (g/100g) (ASTM D5800) | 7.5 |
| Total Base Number (ASTM D2896) | 7.9 |
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| Size | Quart / 946 ml |
$35.00
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