Originally Posted by norcoprop
That's my thoughts and according to the dealer Stihl is not warrantying the carbs anymore because they cant be sure what people are running in them.
Find another dealer. Stihl warrants every part of every gas powered tool. Period. If they were that concerned about your fuel they would take a sample and test it. The percentage of Ethanol in gas is easily tested with a dirt cheap tool. The dealer can do it. You can do it.