WorX FINE with ETHANOL,, Tried it last week ,Made the 730 CASE run LIke a CHAMP ....After i had dumped Some oilSludge gas in the tank ,,, My Gasser Grain truck fuel pump failed and put about 6 galons of gas with the oil,,. i t was drive by nephew about 10 miles with diluted oil gas for in the oil pan ,no rattles in the engine Just Run Crappy and no Oil pressure ,,, Drained it out , poured it in the 730 and went to running , wasn't long before sediment bulb was fullofschitt ,and flow was diminished tyo where 730 needed constant Choke ,, Poured half a can of SEAFOAM in with 15 galoon of E-85,, straightend that 730 rightout ,, Never Had flow problem rest of day,, sure had a bunch of crud in sediment bulb at end of day ,, probably will not do that agauin ,, ..bottom LINE SEAFOAM WORX GREAT ,,, DO NOT USE IN CRANKCASE ,EVEN THOUGH BOTTLE CLAIMS YOU CAN ,,,,itwill kilGM Celibrity CHevys , breaks that crap ouit too fast and i Spun a rad bearing at !60 Thousand miles ,