AMSOIL AMSOIL 10W-40 Synthetic Marine Engine Oil
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AMSOIL 10W-40 Synthetic Marine Engine OilHelp

AMSOIL 10W-40 Synthetic Marine Engine Oil Product Image
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$12.00 Retail Price (USD)
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Product Code: WCFQT-EA
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For use in 4-stroke gasoline fueled engines in marine applications. Offers unsurpassed wear protection, viscosity stability, low volatility and excellent rust protection. NMMA FC-W approved and "warranty certified". For use in 4-stroke outboard and marine inboard engines. Also excellent for personal watercraft.

AMSOIL Synthetic Marine Engine 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. Synthetic Marine Engine 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
Synthetic Marine Engine 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.

  • NMMA Registration: 10W-40 – FC-W (CAT)® Registration Number: FC-00850T

Superior Protection Against Engine Wear
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 Synthetic Marine Engine 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.

Excellent Anti-Rust Performance
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. Synthetic Marine Engine 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.

APPLICATIONS
AMSOIL Synthetic Marine Engine 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®

NMMA FC-W Catalyst Compatible • API SM

Service Life

  • Four-stroke outboard motors and personal watercraft applications: 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 one year, whichever comes first.

Compatibility
AMSOIL Synthetic Marine Engine 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 PRODUCT WARRANTY
AMSOIL products are backed by a Limited Liability Warranty. For complete information visit www.amsoil.com/warranty.aspx.

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). USA and Canada (M)SDS are available upon request at 715-392-7101 or on the AMSOIL Website. Keep Out of Reach of Children. Recycle used oil and bottle.

WCF Package Sizes
Code Package Size Unit of Measure Product
WCFQT (WCFQT-EA) Quart Each AMSOIL 10W-40 Synthetic Marine Engine Oil
WCFQT (WCFQT-CA) Quart Case of 12 AMSOIL 10W-40 Synthetic Marine Engine Oil
WCF30 (WCF30-EA) 30-Gallon Drum Each AMSOIL 10W-40 Synthetic Marine Engine Oil
WCF55 (WCF55-EA) 55-Gallon Drum Each AMSOIL 10W-40 Synthetic Marine Engine Oil
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AMSOIL 10W-30 Synthetic Marine Engine Oil
 
5.0

(based on 9 reviews)

Ratings Distribution

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    (9)

  • 4 Stars

     

    (0)

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    (0)

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100%

of respondents would recommend this to a friend.

Reviewed by 9 customers

Displaying reviews 1-9

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5.0

The best their is

By 

from Illinois

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

I use this oil in my 7.4 liter mercrusier motor. Now Amsoil and Mercrusier recommended that I use the 20w 40 synthetic blend. But I wanted full synthetic. This oil is AWESOME!

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Crusiers inc Holiday 2570
 
5.0

Will buy this product again

By 

from Port Angeles, WA

Verified Buyer

Comments about AMSOIL 10W-30 Synthetic Marine Engine Oil:

Use in my 150HP and 9.9HP Suzuki Outboards

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Suzuki outboards
 
5.0

Great For High Revving Outboards

By 

from Brick NJ

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

Have always used the 10w-40 and 10w-30 marine 4 stroke in my outboard and wave runner engines. Very confident that it holds up well to the high revs.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Diesel Pick Up, Boat, Waverunner
 
5.0

Multiple motors

By 

from Rocky Point, NC

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

I use Amsoil in my:
2008 M-Benz V-6 diesel (meets the 229.51 spec.);
2017 Subaru 2.5 normally aspirated 4 cylinder boxer (0W-20 Signature Series);
2013 Yamaha 90 hp outboard;
1999 Honda V-2 10kw generator;
pressure washer, and lawn mower.

I change oil in all these motors once a year, along with an Amsoil filter for the Forester.
I switched from M____ products to Amsoil after I personally compared the specs for 5 quality motor oils, including the "Subaru" oil (actually Idemitsu Oil) and found that Amsoil matched or was better in most of the parameters on all the oils, particularly the NOACK value (for volatility or "boiling off".) I was especially interested in the 0W-20 values, since I had a chance to choose a specific oil to use in the new Forester for its life. I found that there was a huge NOACK difference between Amsoil and the Subaru/Idemitsu oil. No doubt that is why Subaru recommends a 6,000 oil change interval, and Amsoil Signature Series is at 25,000 miles. None of the other oils matched Amsoil's NOACK value. That comparison convinced me. At 500 miles I drained the Subaru/Idemitsu oil and switched to Amsoil Signature Series, and changed it again at 6,000 miles and am now on a yearly change cycle, since I average between 10,000 and 13,000 miles a year. Cheaper and better – a no brainer.

  • How would you describe yourself?:
  • I'm a DIY handyman

(1 of 1 customers found this review helpful)

 
5.0

The best engine oil

By 

from Topeka, KS

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

AMSOIL is the only engine oil I will use in my vehicles, motorcycle, and outboard motor. It improves the gas mileage on my Victory motorcycle by over 10% compared to OEM synthetic oil. That convinces me that there synthetic oil reduces engine friction and should help the engine last longer.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • GMC pickup, Victory motorcycle, 150hp OB
 
5.0

Good oil

By 

from undisclosed

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

Best four the marine motor, always I used to my cruiser and bow rider, awesome performance

 
5.0

Only oil for my outboards

By 

from undisclosed

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

Only oil my Outboards will ever see. One great oil

(1 of 1 customers found this review helpful)

 
5.0

I will always use this product. Very satisfied.

By 

from undisclosed

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

I use this product in a 2013 mercury 150hp 4 stroke outboard. It runs great with no issues. Living in the northeast our season is short so I can only get about 75 hrs of use. My only issue is that you do not make an oil filter for this engine.

(1 of 1 customers found this review helpful)

 
5.0

I run only Amsoil

By 

from LaFollette, TN

Verified Buyer

Comments about AMSOIL 10W-40 Synthetic Marine Engine Oil:

Have this in my new Waverunners after break in for winter storage.

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