Used in a high revving supercharged Yamaha jet boat that is mostly used in the ocean and I Change oil every 50 hours and engine does not consume a drop of it.

I run this oil exclusively in my 425 HP Yamaha SX-195 Race Boat. It delivers the performance that I need in a high boost application!!

I owned a taxi and shuttle service and did all my own maintenance. I used Amsoil in everything. Never lost a transmission or engine and retired vans at 750,000 miles.

Been running this for a long time

This is my first boat. It has a Yamaha 175hp SHO 4-Stroke. I have Amsoil in everything I own. After the breakin hours passed. I replaced everything with Amsoil. Motor,lower unit and bearing grease. It's the only oil for me. Always a Great choice.

I use this great lube oil for my 1990 Cruisers Esprit with twin Crusader 350's. I am never disappointed with this synthetic, even though they were designed for straight SAE 40. They run smooth and oil pressures are spot on.

Fantastic no issues with this product will buy again and recommend it Thanks

Great product, love it

Use Amzoil in all my cars and motorcycles, jetski's etc. Never had an oil related failure. Will continue to trust Amzoil.

Great stuff. Boat runs way better.

I recently started using Amsoil Marine in our Yamaha Jet Boat. With the boat being 6 years old, I immediately notice a quieter ride and was most impressed by the 5-7% thrust improvement (3-5mph). We will be using it in our jet skis next

Excellent outboard motor oil, engine runs smoother and quit with this oil. I would recommend this product for all outboard motor owners. Best product out there! I live in Hawaii and I never got any free shipping or any free products. Thanks!

Use it on both my Yamaha 2016 115 hp and 2017 9.9 high thrust motors.

Keep the motor cool and quiet

Just recently bought a chaparral SSI sport bowrider boat took it out twice and got 47 miles per hour. change the oil to amsoil 10w 30 for boats take it back to the lake and ran it hard and got a solid 50 miles per hour.

I use Amsoil in my boat for the last three years. The engine seems more quiet and the oil level stays at the same level throughout the boating season.

I bought a Seadoo GTR 215 supercharged unit and was looking for oil to complete an oil change. I've had great success with Amsoil in the past in sleds and atvs so I wanted to use in my Seadoo. I had read mixed reviews about using the Amsoil Synthetic marine oil in the supercharged skis due to supercharger clutch slip. But so far I've had no issues after approx 12 hours of riding.

Can't tell the difference.