Engine performance/maintenance additives

[huston]

Does anyone use any of these additives  and what are the pros and cons of them?- Seafoam, Kwik clean, any Justin Brothers products, Ring free and last,  Pri-G.

[LGMOUTH]

 I use ring free in my Yamaha engine. Although I only keep my boat for one year Yamaha recommends using it to increase performance, milage, and to keep it running smooth. I havent really seen the long term effects of this but like I said Yamaha recommends using it so I do. I havent used any of the others but Im sure someone else on here has.

[smbassman]

I use quickleen in my Mercury Opti - every tank.  I hope to have a new boat before my warranty is up, but in case I don't - the price of the quickleen is peanuts compared to a powerhead replacement.

I also see no carbon build up on my spark plugs when I have checked them.

[canvsbk]

 I use Seafoam in my Merc. And my Dodge. And my Arctic Cat. And my John Deer. And my Weed Eater. And my 6hp Johnson.... 25hp Johnson....chain saw, generator, power auger, air compressor -
haven't tried it in my coffee yet but then I have been feeling a bit slugish lately!

No carbon build up and super clean injectors and carbs.

[bassackward]

I use Sea-foam in everything, it dries moisture from your fuel and crank-case, it cleans carbs and injectors. I have also notice a much cleaner plug on my Mariner. It runs about $7 at any auto parts store, or at Weingartz.

[fishon1219]

I use the ring free in my yamaha. I have used it from the first tank so I dont know if it makes a difference or not. An outboard motor tech told me if the manufacturer tells you to use it, than you should.

[yukonjack2]

I use Ring free in my Evinrude DI  - not sure that it really helps since I 've used it from day 1, but it makes me feel better about it!

Jack

[HellaBass]

I have used SeaFoam in the past, but recently I got turned on to "Full Throttle" and it works great!