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
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
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
- Increased rust and corrosion
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
- 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*
- 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.
AMSOIL 25W-40 Synthetic Blend Marine
Engine Oil is Warranty Secure®, keeping
your factory warranty intact. It 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.
HEALTH & SAFETY
This product is not expected to cause health concerns when
used for the intended application and according to the
recommendations in the Safety Data Sheet (SDS). And SDS is
available via the Internet at www.amsoil.com or upon request
at (715) 392-7101. Keep Out of Reach of Children.
Recycle used oil and bottle.