Well I know I said I was buying a Yamaha SHO, but I fooled around and bought a used 2016 boat with a Mercury Pro XS.

Which oil do y'all use (the specific Optimax oil?), and which ethanol fuel treatment do y'all use (Stabil?)? I was considering the Lucas products.

i use amsoil and seafoam.

Merc and Seafoam

ONLY use Mercury optimax oil or Mercury premium plus oil. And fuel treatment id use yamaha ring-free

According to what the motor has ran since break in. Optimax oil is higher, it's a full synthetic. Around $30 a gallon. Premium plus is a semi synthetic and is around 23-25$ a gallon

And btw, Mercury Pro XS engines can either according to Mercury. Doesn't solely have to be optimax oil.

I use premium plus and bioborEB works fine but I always run ethanol free in my boat. Got a shell station by the house that's 24hrs. It's 2.79/gal right now but it's worth not having a problem. Go ahead and buy you a few fuel filters and the metal adapter. I change them out once a year

I haven't used ethanol since I moved to Alabama. But in Texas, I used Star Tron during fishing season. When hunting season started, I added a bottle of Marine Stabil and filled up the gas tank. Disconnected the fuel line and ran the motor until it ran out of gas. Lastly, a quick shot of fogging oil went in the carbs.

Mercury recommends using the Optimax oil, using anything else could cause warranty issues. I also use the mercury yellow label fuel treatment in every tank to help or prevent carbon build up. I'll add the green label ethanol treatment if it's gonna sit for a month or more. Thankfully that hasn't happened in years!

After seeing the damage caused by Ethanol gas to lines and hearing two different small engine guys saying "that stuff keeps us busy", I only use non ethanol now and just ease off the throttle a little.

I run the Yamaha ring free in my SHO, have buddies with Mercs, they use it too

Use Quickleen and Startron in every tank!! DFI oil is recommended but most around here use premium plus.

Freedom marine will fill empty jugs with DFI very reasonable

startron

Quickleen and Quickcare and DFI oil.

Non ethanol gas and stabil marine.

If at all possible, DO NOT use ethanol gasoline in that engine...or any 2 stroke, for that matter.

I use ACES IV for 2 strokes in every tank of gas I run through my outboards. Initial price seems high, but the small amount of additive it actually takes per tank (1 oz per 6 gallons) makes it pretty reasonable. Best product I've seen for cutting down on carbon build-up on piston tops.

Yamalube Ring-Free is good too. I used it with pretty good results before I discovered ACES IV.

As previously stated...that engine should be under warranty, therefore you should use only what's recommended by mother Merc...which is probably their Optimax oil.

I do not suggest SeaFoam in 2 stroke engines, because it contains a fair amount of alcohol as one of its ingredients...the main thing you're trying to avoid/combat.

Pay extra and buy non ethanol even if you have to drive a little farther it will save you money on repairs later.I had to have carbs rebuilt twice in 3 years because of it. Stopped using it after the last rebuild and have never even needed the carb cleaned or adjusted in the last 5 years. Only thing I'll ever put ethanol in is my truck..

This^^
And go out in your boat at least once a week.