Good stuff! Got it in my cars, trucks (diesel & gas), tractors, mowers, saws, skid steer, backhoe, boat, bikes, & bedrooms (squeaky hinges/springs ya know). AMSOIL hasn't let me down in 25 years. Proud, proud, proud!

Been using Amsoil Marine Oil since motors were new, 2009. Have had zero engine problems. Also use lower unit oil, filters and grease. Quality products

Two Thumbs Way High !

I have been running Amsoil marine products in my Yamaha SHO outboards since 2014. The motors run great even under the heavy strain of "run and gun" bass fishing. Shifting with the Amsoil lower gear oil is fantastic, no clunking going between forward/reverse and the contamination during yearly changes is minimal.

Have used Amsoil in my Honda 225 s since new in 2006..they now have 1000 hours on them..they have never used any oil ..oil after each season looks like it has never been used

Can’t get better protection.

This is the best marine oil out there. Tested it in my boat.

I will be changing the oil in my boat motor sometime this spring. this will be the second season on the motor. I was advised by the dealership to use Mercury marine oil on the first oil change for brake-in purposes. This will be the first oil change for Amsoil.

We have been using this oil in our 1991 4.3L engine for over a decade. The engine now has a few thousand hours on it. We use nothing but Amsoil in all our rigs (trucks, sleds, boat motors)

75 HP Yamaha.This oil is great as the years have shown me; as this engine idles 3-6 hours without carbon buildup and when i accelerate to top speed (weather permitting) there is no smoke or hesitation When I check the spark plugs they are in excellent condition .

Have been using Amzoil for 17 year's have never had an oil related problem. Put marine oil in 300 hp mercury and 15 hp kicker the kicker was noticeable smoother running.

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.