Amsoil 25W-40 Synthetic Blend Marine Engine Oil when engine performance and reliability are key to a successful day fishing or boating. High-rpm operation and constant exposure to water, however, invite engine wear and formation of rust and corrosion, reducing engine performance and life. Amsoil 25W-40 Synthetic Blend Marine Engine Oil guards against wear while delivering excellent protection against rust and corrosion. It is Warranty Secure® and will not void your marine engine’s warranty.
Protects Against Wear
Marine engines operate under high loads and rpm for extended periods. On average, a marine engine powering a boat 30 mph runs at about 5,000 rpm. In contrast, an automotive engine powering a car 60 mph runs at about 2,000 rpm. Higher stress causes traditional automotive oils to break down and lose viscosity. AMSOIL 25W-40 Synthetic Blend Marine Engine Oil is designed with excellent shear stability to deliver a consistent lubricating film. It helps guard engine components from wear for maximum life.
Excellent Anti-Rust Performance
Marine engines are prone to rust and corrosion due to constant exposure to humid, wet environments. Rust on engine parts acts like sandpaper, scouring bearings, the cylinder wall, piston rings and other components, while aluminum pistons and other parts can corrode. Rust and corrosion reduce engine power and eventually cause catastrophic failure.
Package Sizes (WCM)
|WCMQT (WCMQT-CA)||Quart||Case of 12|
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Good rust protection is not natural to motor oil; it comes only by design. AMSOIL 25W-40 Synthetic Blend Marine Engine Oil is fortified with potent inhibitors that guard against damaging rust and corrosion.
- Excellent high-stress, high-rpm endurance
- Increased rust and corrosion protection
- NMMA Certified
AMSOIL 25W-40 Synthetic Blend Marine Engine Oil is certified by the National Marine Manufacturers Association (NMMA) for use in four-stroke outboards, inboards, stern-drives (inboard/outboards) and PWC. This high-quality oil demonstrates outstanding performance and exceeds the NMMA “FC-W” (Four Cycle – Water) specification requirements.
- FC-W (CAT)® Registration Number: FC-11825T
* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are AMSOIL-engineered for use in the applications shown.
Use in gasoline-fueled four-stroke inboards, outboards, inboard/outboards and personal watercraft that require any of the specifications listed below, including those made by Mercury* and Mercruiser*.
- API SM
- NMMA FC-W Catalyst Compatible
Four-stroke outboard motors and personal watercraft: Due to potential fuel dilution or water contamination, change oil at the engine or watercraft manufacturer-recommended interval. Inboard and I/O applications: Change oil at two times the engine manufacturer-recommended interval, or once a year, whichever comes first.
Outboard Synthetic 2-Stroke Oil is Warranty Secure, keeping your factory warranty intact. Outboard Synthetic 2-Stroke Oil is a high-performance replacement for vehicle manufacturer-branded products and is also backed by the Amsoil Limited Warranty (G1363). For details, visit www.amsoil.com/warrantysecure.
|TYPICAL TECHNICAL PROPERTIES 2-Stroke (WCM)|
Amsoil Injector Oil
|Kinematic Viscosity @ 100°C, cSt (ASTM D445)||16.0|
|Kinematic Viscosity @ 40°C, cSt (ASTM D445)||139.3|
|Viscosity Index (ASTM D2270)||155|
|Pour Point °C (°F) (ASTM D97)||-31 (-24)|
|Flash Point °C (°F) (ASTM D92)||230 (446)|
|Four-Ball Wear Test|
(ASTM D4172B@40kg,75°C, 1200rpm, 1hr), Scar, mm
|Noack Volatility, % weight loss (ASTM D5800)||3.1|
|High-Temperature/High-Shear Viscosity cP (ASTM D5481)||4.8|
|Total Base Number||7.9|
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