25W-40 Synthetic Blend Marine Engine Oil
 25W-40 Synthetic Blend Marine Engine Oil

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.

Package sizes include:

1-Quart Bottle
1-Quart Bottles (case of 12)

Product Code: WCM • Brand: AMSOIL




MSDS Data Sheet

Product Details Tech Data Reviews & Rating

Product Applications
AMSOIL 25W-40 Synthetic-Blend Marine Engine Oil is formulated specifically for Mercury motors that encourage the use of synthetic-blend oil. With this formulation, AMSOIL offers Mercury owners a superior choice who prefer to follow Mercury's synthetic-blend guidelines.

AMSOIL 25W-40 Synthetic-Blend Marine Engine Oil can be used 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*.

Product Application Specs

• API SM
• NMMA FC-W Catalyst Compatible

Product Description
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.

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.

NMMA Certified

Service Life
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.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL WCM.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES
25W-40 Synthetic Blend Marine Engine Oil (WCM)
API SM, NMMA FC-W Catalyst Compatible
Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 16.0
Kinematic Viscosity @ 40°C, cSt (ASTM D-445) 139.3
Viscosity Index (ASTM D-2270) 155
Flash Point °C (°F) (ASTM D 92) 254 (489)
Fire Point °C (°F) (ASTM D 92) 284 (543)
Pour Point °C (°F) (ASTM D 97) -31 (-24)
Noack Volatility, % weight loss (g/100g) (ASTM D-5800) 3.1%
Four Ball Wear Test (ASTM D 4172 @ 40 kgf, 150°C, 1800 rpm, 1 hour, Scar in mm) 0.40
Total Base Number (ASTM D-2896) 7.9
High-Temperature/High-Shear Viscosity @ 150°C, 1.0 x 106 s-1, cP (ASTM D4683) 4.8

Did this product meet your expectations?

(click on a star to rate)
Product Name: 25W-40 Synthetic Blend Marine Engine Oil
Current Rating: 5 out of 5 stars
Total Votes: 3 vote(s)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by jherm1: space

Great oil as usual

switched over from mercury oil to this...amsoil is the only oil I use for everything

Item Reviewed: 25W-40 Synthetic Blend Marine Engine Oil

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Runky: space

Great for my boat

Switched my marine big block over to Amsoil 25w-40 and have seen better oil pressure and increased performance over 30w oil. I'll definetly use this oil again.

Item Reviewed: 25W-40 Synthetic Blend Marine Engine Oil

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by gofastman: space

Awesome

I purchased tis for my mercury, and i cant say enough about it, I have enjoyed using the amsoil product in everything i have and i will continue the use of it

Item Reviewed: 25W-40 Synthetic Blend Marine Engine Oil
Share your AMSOIL Experience
by writing a review
smaller | bigger





Click Here to Report Problems Or Comments
3 Easy ways to place your order now!



Receive AMSOIL's Confidential Factory Direct Wholesale Price List in your email.
Enter your first name & email address and click on "eMail Price List" button!
AMSOIL Online Store
AMSOIL Preferred Customer Program. Save upto 25%!
Wholesale Business Accounts
Become an AMSOIL Dealer!
Request FREE AMSOIL Catalog
Questions? Please Contact us
Order AMSOIL By Phone
AMSOIL Online Store
Order AMSOIL By Fax
VISA and MASTERCARD is accepted for US and Canada.
Discover and American Express is accepted for US customers only
Go to Top