I used to blindly run Ultra because synthetic = good right? It was not until we had several spark screens and plugs get fouled/clogged and I did some research and found out otherwise.
I have since switched to red armor 40:1, but my dad still runs orange Stihl at 50:1 and has for a long long time and his saws pre date my existence by like 10 years soooooo...... there is that. I have also torn down several of his that he retired to me because he says he no longer has the patience to fix them lol, and have seen no yesevidence of increased wear or excess carbon build up.
I think folks get too wound up on what oil to run, mix it at your preferred ratio with good gas and let er rip tater chip! Unless its Ultra, ultra should be deleted.