I use a small amount of Marvel Mystery Oil added to the gas in my old cars,trucks and tractors. Never had a valve problem. I can buy AV-Gas from the local airport at $4.00 a gallon, but why waste the money.

Wanted Good Woman:
Must be able to cook , clean , sew , tune engines and polish trucks. Must have old Stovebolt and garage. Please send picture of old Stovebolt and garage.