Customer Ratings & Reviews

Better than Mobile 1. Increased top end, engine runs more smooth at idle. Don't waste your time buying oil from the outboard manufactures, over priced and over rated. Amsoil exceeds Suzuki requirements and will not void warranty. Bought a case, saved on the shipping.

I started using amsoil in my Yamaha because I did not have hour meter to keep track of hours thinking amsoils superior oil would give me some forgiveness if I went a little over recommend hours. I added hour meter, will still use amsoil under preferred customer plan.

I use this in my 50hp 4- stroke and you could immediately tell a difference. It ran much smoother and quieter.

Great marine oil. Use it in the boat and jetskis.

I've added this to my marine inboard motor and seems to be running very well

Outstanding product...

Installed in both of my 8.1L Mercruuser engines on my 40' Boat. Also going in my generator. Hope to get the advertized results.

I have used the 10w40 Marine oil in my Yamaha Waverunner for awhile and to date just great results.

I have ued this in my 115 mercury efi fourstroke and also my 150 efi fourstroke. Now I use it in my Mercury 225 Verado. Best oil to use here in Canada . No more hard starting when the température gets down close to freezing and a great remplacement for Mercury 25-40 semi synthétique oil.

Using it in my third engine with great results. Not a repair one on the first two. Keeps engine very clean.

I like the product, oil seems to be better then YamaLube, Stays clear longer, while YamaLube becomes non transparent and dark grey almost black within 10 hrs. Have AmsOil in high RPM SVHO engine for 35 hrs now and its still clear and light yellow color. However overall purchasing experience was less the pleasant. First, even though the address was correct, they did not ship on time because they could not read the address properly, then the courier didn't know what to do with the package. So because of that it unnecessary took long time to receive the product.

having a $15k investment and protecting it starts with Amsoil. I use it in everything I own an have had ZERO problems.

Works great in my supercharged Sea-Doo. No issues with supercharger slipping, motor runs very smoothly. Will continue to use this.

I use this oil in my 7.4 liter mercrusier motor. Now Amsoil and Mercrusier recommended that I use the 20w 40 synthetic blend. But I wanted full synthetic. This oil is AWESOME!

Use in my 150HP and 9.9HP Suzuki Outboards

I use Amsoil in my: 2008 M-Benz V-6 diesel (meets the 229.51 spec.); 2017 Subaru 2.5 normally aspirated 4 cylinder boxer (0W-20 Signature Series); 2013 Yamaha 90 hp outboard; 1999 Honda V-2 10kw generator; pressure washer, and lawn mower. I change oil in all these motors once a year, along with an Amsoil filter for the Forester. I switched from M____ products to Amsoil after I personally compared the specs for 5 quality motor oils, including the "Subaru" oil (actually Idemitsu Oil) and found that Amsoil matched or was better in most of the parameters on all the oils, particularly the NOACK value (for volatility or "boiling off".) I was especially interested in the 0W-20 values, since I had a chance to choose a specific oil to use in the new Forester for its life. I found that there was a huge NOACK difference between Amsoil and the Subaru/Idemitsu oil. No doubt that is why Subaru recommends a 6,000 oil change interval, and Amsoil Signature Series is at 25,000 miles. None of the other oils matched Amsoil's NOACK value. That comparison convinced me. At 500 miles I drained the Subaru/Idemitsu oil and switched to Amsoil Signature Series, and changed it again at 6,000 miles and am now on a yearly change cycle, since I average between 10,000 and 13,000 miles a year. Cheaper and better - a no brainer.

AMSOIL is the only engine oil I will use in my vehicles, motorcycle, and outboard motor. It improves the gas mileage on my Victory motorcycle by over 10% compared to OEM synthetic oil. That convinces me that there synthetic oil reduces engine friction and should help the engine last longer.

I use this product in a 2013 mercury 150hp 4 stroke outboard. It runs great with no issues. Living in the northeast our season is short so I can only get about 75 hrs of use. My only issue is that you do not make an oil filter for this engine.

Have this in my new Waverunners after break in for winter storage.