Customer Ratings & Reviews

This oil made my outboard run smoother!

I’ve been using this synthetic oil in my F115 Yamaha for years. My engine has been trouble free, averaging 95 engine hours per season!

most expensive oil in the world best oil in the world

most expensive oil in the world best oil in the world use it in my 75hp Yamaha since it was new in 2003

My Mercury 25 hp four stroke has a strict diet! And AMSOIL is what it craves!

Mercury outboard oils are a blend which I do not like. Prefer 100% synthetic for my engines.

I HAVE CHANGED ALL OF MY FLUIDS OVER TO AMSOIL. THE BOAT ENGINE SEEMS TO FIRE UP QUICKER AND RUN MORE SMOOTHLY WITH THE AMSOIL MARINE 10-40. MANY FELLOW BIG MOTOR PEOPLE I KNOW STILL USE 20-50 OR STRAIGHT 50 IN THE HEAT ON LAKE MOHAVE AND HAVASU, BUT I HAVE FOUND IM STILL CONSISTENTLY AT 50 PSI OIL PRESSURE AT OPERATING TEMP AND AM HAPPY WITH THAT

I have been using Amsoil for years in our cars with never a problem, so I’m now using it in my pontoon four stroke outboard great product!

Excellent oil characteristics that prolong engine life during hot summer months and cold winter storage. love this oil.

I have run this oil in my 4 stroke Suzuki DF50 outboard since I took the break in oil out. This motor gets run HARD either running wide open up the Missouri River or idling for long periods in no wake areas and this oil shows no signs of giving up between 100hr service intervals. The inside of this motor is spotless and I don’t worry about corrosion even during longer term storage.

My Yamaha F115 outboard runs smoothly and efficiently. Been using this oil for the last 5 years, highly recommended!

I've been using this oil in my 75hp Yamaha for 10 Plus years I'm a charter boat for fishing which means I depend on my motor running at peak performance This motor idles for 2-6 hours per trip. I inspect my spark plugs regularly and have never had an issue with fouling plugs. when i go to full throttle she never lets me down. I change its oil once a year and like what I see.

Great oil as always. However, got a new motor this year and the look up guide sucks. Hasn’t been changed in years. Just refer to your owners manual for correct application.

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.

Very poor service