Originally Posted by
markkal
High Big Piston and KRviator, I checked the Lycoming service instruction pamphlet as per link, unfortunately my engine AEIO 580 does not qualify to use UL unleaded fuel,
Me and my friends have this engine on aerobatic aircrafts and we are worried, GAMI fuel should be compatible, though I don't even know if it is still at development stage and it would be available only in the US, Let's se what happens. Thank you for your asistance
Worse case is you will have to convert your AEIO 580 to a AEIO 540D which can run on 94 UL. I believe it can be done by replacing the connecting rods and pistons with 540 parts. You may even be able to get away with just replacing the pistons.
Not cheap, I know but better than grounding the airplane