Great product. Used in a 2004 Seaswirl. No problems.

This is the only oil for my Yamaha big motor and my kicker. Amsoil is the way for me

Put this oil in my 2003 Suzuki 4 stroke. Got about 80 hours on the oil. Amsoil superior modifiers work as engineered. Allows the filter to remove all impurities. Oil looks like new. I just change oil filter after the first run of the season

We have a 23 ft Chapparal with a Chevy 454 and a Mercruiser Bravo3 outdrive. The 454 has 750 hours and runs as smooth as silk. The Amsoil 10W40 Marine is very special. The throttle response is incredible and the consumption of fuel is minimal. Considering this is a Chevy / Mercruiser454 I expected this boat to be a gas guzzler. The Mercruiser 7.4 liter has multi port fuel injection and is far more efficient than the Chevy 350 Mercruiser. Using Amsoil synthetic has made a tremendous difference. We cruise our boat on Lake Geneva in southern Wisconsin, and can circle the 25 to 26 miles around the lake using a little more than 5 gallons of fuel. The previous owner was somewhat cheap and used 10W40 conventional oil. He got about 3 mpg and refused to believe the difference I got using Amsoil. My fuel savings over the course of the Summer paid for the 6 qts of of Amsoil 3 times over using conventional oil. This is a clear cut example of cost versus price. I can actually say that the Amsoil literally paid for itself over lower priced conventional oil.

Just did the 100 hr service on my new Yamaha VF90. I read and researched for weeks before deciding what brand oil to go with. I went 10w-40 because sometimes I’m running hard in +100° temps. From all the research I did on this oil, I have no doubt that it will fulfill my expectations.

I have been using Amsoil in my Harley for year. I bought a seadoo this year and it was a no brainer for me to check the Amsoil site to see if they have an oil for it. They did not disappoint. Excellent product and highly recommend it. A friend of mine just bought a new seadoo. He called me up and ask about the first oil change. I told him to get the Amsoil. We did our oil changes together and love the product. Hands down the best decision you can make for your seadoo

Great oil very happy very fast shipping from order to my door in 2 days or less

For the same price as conventional Yamalube, I'm running what has always been considered the gold standard of oils. My boat feels quicker, it *is* more fuel efficient, and after 50 hours it still looks brand new. I'm sold.

boat has never run better and i have peace of mind knowing my engine is well protected. This is the only motor oil I will use in my 2005 yamaha.

using this in my Suzuki give peace of mind

I've been using Amsoil marine oil in my Yamaha F250's since new (after 25hr break in) in 2016. No issues, great oil.

Quality oil

Works well in my 4 stroke outboard.

Dealer told me only to use this oil when changing, even though my motor is a yamaha.

Always used Amsoil products in all my vehicles. Never had any issues.

Looked for this product everywhere. Finally sourced it from Amsoil. Using it in my Suzuki 50hp marine engine. Fine product. Will definitely use again.

Great oil, picked up an extra 2 mph on my Suzuki DF90. Synthetic is the way to go in outboards especially if you operate in saltwater. Motor was super quiet and ran smooth.

Have used the Amsoil marine products in my last two Yamaha SHO outboards (150 and 225). The oil shows minimal discoloration and wear even after a full season on the water, in addition it meets all of Yamaha's standards for oil per their manual. My boat is used from March to Nov and I never worry about drastic cold or hot temps impacting engine performance when running Amsoil.

I always use Amsoil in my Sea Doo & all my power boats so i know it is protected.

excellent oil. have used it for years with no problems