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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AMSOIL Synthetic Marine Engine Oil is a premium synthetic formulation designed to withstand the heat and stress of high-rpm operation and deliver excellent wear protection. It protects against rust and corrosion during periods of inactivity and long-term storage to keep your engine protected, even when it’s not running. Synthetic Marine Engine Oil is perfect for hardcore anglers and boating enthusiasts who demand the best protection for their marine engines.

Fights Engine Wear
AMSOIL Synthetic Marine Engine Oil's naturally strong base oils resist viscosity loss due to mechanical shear. The oil develops a tough lubricating film that protects engine parts, even in high-heat, high-rpm conditions that breakdown other oils. Synthetic Ma-rine Engine Oil contains robust anti-wear additives that further reduce wear in metal-to-metal contact regions, guarding against compression loss for maximum power and extending the lives of marine engines.

Excellent Anti-Rust Performance
Good rust protection is not natural to motor oil; it comes only by design. AMSOIL Synthetic Marine Engine Oil is fortified with potent inhibitors that guard against damaging rust and corrosion. It protects engines during use and during inactivity or long-term storage.

  • Excellent high-stress, high-rpm endurance
  • Increased rust and corrosion protection
  • NMMA FC-W Catalyst Compatible

NMMANMMA Certified
Synthetic Marine Engine Oil is certified by the National Marine Manufacturers Associa-tion (NMMA) for use in four-stroke outboard motors. This high-quality oil demonstrates outstanding performance and meets the requirements of the NMMA FC-W Catalyst Compatible specification, which is backward-compatible with the FC-W specification.

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

APPLICATIONS
Use in gasoline-fueled four-stroke inboards, outboards, inboard/outboards and personal watercraft, including those made by Honda*, Mercury*, Yamaha*, Johnson/Evinrude*, Bombardier/BRP*, Suzuki*, Nissan*, Tohatsu*, OMC*, Volvo-Penta*, Mercruiser*, Chevrolet* and 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 other synthetic and conventional motor oils. Adding other oils, however, will shorten the life expectancy of AMSOIL motor oils and reduce their performance benfits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Marine Engine oil.

WARRANTY SECURE®
AMSOIL Synthetic Marine Engine Oil is Warranty Secure, keeping your factory warranty intact. AMSOIL Synthetic Marine Engine Oil is a high-performance replacement for vehicle manufacturer-branded products and is also backed by the AMSOIL Limited Warranty. For details, visit www.amsoil.com/warrantysecure.

Warranty Secure

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). An SDS is available online at www.amsoil.com or upon request at (715) 392-7101. Keep Out of Reach of Children. Recycle used oil and bottle.

* 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 developed by AMSOIL for use in the applications shown.

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
More about AMSOIL Reviews

REVIEW SNAPSHOT®

by PowerReviews
AMSOIL 10W-40 Synthetic Marine Engine Oil
 
4.9

(based on 15 reviews)

Ratings Distribution

  • 5 Stars

     

    (14)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

The best 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. ...Read complete review

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.

VS

Most Liked Negative Review

 

Oil for my PWC

I like the product, oil seems to be better then YamaLube, Stays clear longer, while YamaLube becomes non transparent and dark grey almost black within 10 hrs. Have AmsOil in high RPM SVHO...Read complete review

I like the product, oil seems to be better then YamaLube, Stays clear longer, while YamaLube becomes non transparent and dark grey almost black within 10 hrs. Have AmsOil in high RPM SVHO engine for 35 hrs now and its still clear and light yellow color.

However overall purchasing experience was less the pleasant.

First, even though the address was correct, they did not ship on time because they could not read the address properly, then the courier didn't know what to do with the package.
So because of that it unnecessary took long time to receive the product.

Reviewed by 15 customers

Displaying reviews 1-10

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5.0

In all Mercury four strokes

By 

from St-Zotique

Verified Buyer

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

I have ued this in my 115 mercury efi fourstroke and also my 150 efi fourstroke. Now I use it in my Mercury 225 Verado. Best oil to use here in Canada . No more hard starting when the température gets down close to freezing and a great remplacement for Mercury 25-40 semi synthétique oil.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • Princecraft
 
5.0

Yes

By 

from Cortland ob

Verified Buyer

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

Yam sport boat

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Chevy gmc trucks yam sport boat
 
5.0

Great Product

By 

from Casey,IL

Verified Buyer

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

Using it in my third engine with great results. Not a repair one on the first two. Keeps engine very clean.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Mercury 4stroke
 
3.0

Oil for my PWC

By 

from Canada

Verified Buyer

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

I like the product, oil seems to be better then YamaLube, Stays clear longer, while YamaLube becomes non transparent and dark grey almost black within 10 hrs. Have AmsOil in high RPM SVHO engine for 35 hrs now and its still clear and light yellow color.

However overall purchasing experience was less the pleasant.

First, even though the address was correct, they did not ship on time because they could not read the address properly, then the courier didn't know what to do with the package.
So because of that it unnecessary took long time to receive the product.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2016 Yamaha FX SVHO Cruiser
 
5.0

best of the best!!

By 

from madison wi

Verified Buyer

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

having a $15k investment and protecting it starts with Amsoil. I use it in everything I own an have had ZERO problems.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 2014 Skeeter MX1825

(1 of 1 customers found this review helpful)

 
5.0

Great for Sea-Doo

By 

from Lexington, SC

Verified Buyer

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

Works great in my supercharged Sea-Doo. No issues with supercharger slipping, motor runs very smoothly. Will continue to use this.

  • How would you describe yourself?:
  • I'm a DIY handyman
 
5.0

The best their is

By 

from Gurnee 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

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