I am happy to hear all of these things! This confirms my suspicion that the shop guys are full of sh*t.
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Don't be too hasty. After doing some research, I have found that seafoam, or variants there of, can indeed do damage. The biggest problem is that people think more is better. Seafoam is harsh, and little dab will do ya, so never use more than the can says to. Gasoline now contains 10% ethanol (alcohol), and one of the main ingredients in seafoam is alcohol. So we are taking a bad situation and making it worse, as far as alcohol is concerned. (alcohol abosrbs water from the air, so more alcohol=more water in the tank) However, alcohol is a fantastic cleaner, and if you are having a problem, say with gum in the carbs, then it can really help clean things out. But, if a machine is used frequently enough, the alcohol in fresh gasoline will have the same effect as seafoam.
I have several mowers, snow blowers, ect.. that sit most of the year. I only used seafoam one time on a used mower I just bought because it was running a little rough. Since then, I have never used it on that mower again and it has ran great ever since. There are better products for long term use. Startron and Stabil are the top two. I have used both, and the mowers start every spring on the firs try.
Again, seafoam is a great product, but only when used properly.