Ever since I purchased my RV12 I have added 1oz of "Sea Foam" to my 93 octane auto gas per gallon. I use it incase I don't get to fly so the gas doesn't go bad. It states it protects fuel for two years.. I have used it on any vehicle, boat, lawn mower I've ever had, especially the mower which sits unused during winter, it also claims to be an upper cylinder lubricant as well as carbon remover. I took apart my 70 hp outboard motor (2cyl) and it was nearly carbon free, it was 23 years old, just a very light amount on piston heads and I mean very light amount. My 912 ULS starts easily and I never have ignition issues, she runs very smoothly, I have 315 hours on it and of those I have put 130, maybe it could be of help.
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