It is primarily a fuel system cleaner. Works well. Check at your local auto parts store. $8-10 a can

It's a fuel stabilizer as well. Says it right on the can. Check out their website. It's not just for mowers. It's available everywhere. Wal Mart etc.

Here is a link that might be useful: SeaFoam

It also can deposits too. They even have a spray version called Deep Creep for spraying into the carb for decarboning.

Does seafoam have a shelf life like Stabil. Just wondering because Stabil usually expires before I use it all.

Stabil has a shelf life of 2 years and they make it in pretty small bottles (4 ounce bottle treats 10 gallons). You can also double up the dosage to push the 12 month it keeps the fuel fresh out to 24 months. If you don't use it up in 2 years you can always pour it in your cars tank.

I have had Stabil go bad and it broke down into little flakes of red. I wouldn't pour it into my car though. ;')

Thanks for the info. I have 1 more question. Can Seafoam be used in 2-cycle mix as well? Since its pretty much impossible to find gasoline without ethanol now, I use Stabil all the time. I've heard gas with ethanol loses its punch after about 30 days if not treated.

Read the label on your 2-cycle oil - most contain fuel stabilizer. I like to add 1 oz/gal Marvel Mystery Oil to my 2-cycle mix in addition to the regular oil. an ounce of Seafoam wouldn't hurt anything and would help clean the engine.

I have a Stihl Kombi system with the "4 mix" engine. Their 2 cycle oil does have fuel stabilizer in it, but it sounds like the Seafoam might help with keeping the valves clean as well. My mission this weekend will be to find and purchase it. Thanks for the explanations and help.

I use Seafoam 100% of the time. When I buy gas, I put both Stabil and Seafoam in at the same time, then I mix the quantity I need with 2 cycle oil for my trimmer and blower and the rest of it for my Mantis, mower and tiller.

I have been doing this for over a year. I am a home owner so I don't put a lot of hours in. I just took off the muffler of my Shindaiwa M242. No deposit to talk about, the piston and cylinder wall still have the original mechine marks on it. No wear to talk about. I did not even clean anything and just put it all back!!!!

Thanks yungman, your answer is exactly what I was looking for, as I was hoping to mix Stabil & Seafoam together in the gas. Will give it a try tomorrow.

I do a lot of work on Hyster Forklifts and Seafoam helps clean sticking valves.
Marvel Mystery Oil is also an excellent product.

Can Marvel Mystery oil be added to 2-cycle mix?

MMO is very good in 2 cycle mixes. Some add 1 ounce per gallon to their normal mix and some substitute 25% of the 2 cycle oil with MMO. I've done both and have had good luck. MMO is a great product.

I don't think I would do substitution of 2 cycle oil. Add on top of the 2cycle oil would be my choice. Both MMO and SeaFoam are thinner than 2 cycle oil, I don't know whether it has the lubricating ablility as the real oil. They are not meant to be libricant exactly.

Go tho this link
http://www.marvelmysteryoil.com/index.php/site/faq/#fuel.

I first started using Marvel Mystery oil in gear boxes on Printing Presses. Prior to using it there was always scum on the gears. After using Marvel Mystery oil I never saw the scum again.

Yungman, the substitution method is the one recommended by Marvel. You can't do it with Seafoam but I've been mixing my 2 stroke oil for my Lawnboys at 40:1 and then adding enough MMO to bring the mix up to 32:1. This is less than the 25% that Marvel recomends but has worked great for me for over a year now in 9 different mowers. The "thinning" you refer to is minimal due to the amounts used.

As a side note. I do add MMO to my Stihl chainsaw mix. I never run 50:1 anymore. I add enough MMO to bring the mix to 40:1 to run in my MS-250. It's been running great since the fall of 2008.

Well, that is enough for me, if you have used it for a whole year and you equipment is still working then it must be good stuff ; )