I haven't been good about changing the oil in my boat. In fact, I don't remember the last time it was changed. On an episode of Engine Masters, they talked about how engines that are not used often can collect water in the crank case when the engine heats and cools but never gets hot enough to boil out the water. And don't forget about fuel. Because Amsoil is designed for this type of application, it is worth the extra cost to have the piece of mind that my boat is protected and won't let me down because of oil break down.

I got the Amsoil Marine 10W40 Full Synthetic. I bought my new 2020 boat/motor/trailer package in 2020. I have a Suzuki DF90A. I had the oil changed at 14 hours, this was my 20 hour oil change since I live about two hours away from the dealership that I bought it from. The motor only had an hour on it’s oil change, but I changed the oil/filter to my Amsoil 10W40 Marine and I love it. The motor fell in love with it. It was like bathing in liquid gold! Now that I have gone to Amsoil 10W-40 Marine, I plan on never going back to any of the others! Thanks Amsoil

The only oil I will use in my outboard motors. You can hear and feel the difference.

Amsoil is great to deal with , no hassle just place an order and it’s at your door a couple of days. The product speaks for it’s self I work on the ocean year round, at times it’s a very harsh environment on outboards. With amsoil oil in my outboard I see better performance then any other oil I’ve used in some 45 yrs.

Being on the water fishing most days I wanted a lubricant to give me the longevity 4 stroke outboards need. I have confidence Amsoil will.

I’ve just put this in my Honda 20 hp motor so it’s too early to tell how it will be long term. It is a beautiful honey colored oil.

Getting close to 5000 hours on my outboard and it still runs good. I believe it’s because I use amsoil oil synthetic.

When I spend so much money on new waverunner, I sure want the best oil money can buy.

Engine idles smoother and running better and quieter than it ever has.

Yamaha recommends changing engine oil every 100 hours or yearly on their SHO outboards. Using the Amsoil marine oil I am amazed how clean the product looks with that many run hours when changed. After removing the OEM oil from my motors and switching I noticed smoother operation when idling and lower overall temps when making long wide open runs. Based on my experience over the last 8 years running the marine oil several friends with Mercury and Suzuki motors have switched recently and their comments echo my own.

The factory oil my outboard calls for was looking like it came out of a diesel after 50 hours. This Amsoil stays much cleaner and that gives me piece of mind.

It looks to work great for me on the jet ski.

I've been using Amsoil synthetic oil in every machine I own for the last 10+ years. Lawnmower, jetskis, 4 wheelers, 3 vehicles. I'm convinced it is the ultimate oil choice.

Been using 10w40 marine oil for 3 years now won’t trust any other oil for my 5.7L I run hard and sometimes long to get to the fishing grounds I don’t wanna worry about oil and I never do with Amsoil great stuff

Why not use the best oil available for hour expensive toys. My boat motor is worth it.

Good stuff

I have been using AMSOIL in all of my motor vehicles. My boat runs super smooth with this synthetic marine oil and I would highly recommend to anyone who is looking for new oil. Cannot beat the quality.

First oil change on the waverunner and wanted to go full synthetic to ensure that my expensive investment lasts for years to come.

Seems to be the best for the engine.

I have been using this oil for years And very happy with it