fuel stabilizer

[Ray]

I use Ring Free and that's it. Yamaha recommended using it.
I had a 200 Mercury for almost 14 years and never added anything, except Sea Foam once a year. It never hic-uped, every. It cleaned the rings out like Ring Free, but it did it once a year instead of with every tank.
I still use Sea Foam once a year. If it worked for 14 years, why stop using it.
But I don't let my boat sit up for a long time. I use it at least once a month.
Best thing to do is leave the tank full, unless you use her a lot.