Now that GAMI's G100UL is fully approved and awaiting distribution, owners are hearing questions about how unleaded fuel might cause valve damage in aircraft engines. It was once a thing in car engines, but in this video, AVweb's Paul Bertorelli examines the issues and finds valve seat recession an unlikely consequence of using unleaded aviation fuel.
Addition AVweb videos on unleaded fuel
The Long, Twisted and Slightly Ridiculous Story of Avgas Part 1
https://www.youtube.com/watch?v=9F-WngVMJBQ&t
The Long, Twisted and Slightly Ridiculous Story of Avgas Part 2
https://www.youtube.com/watch?v=Mvse4Xhzwuk&t=1s
G100UL Approval
https://www.youtube.com/watch?v=ibIkuyBL9i8