I have routinely ran my O-540 at 50 degrees LOP. I was just reading the "Leaning Lycoming Engines" article straight from Lycoming and it says to run it 100 degrees ROP. I thought this was the worst possible setting to run an engine so now I'm really confused!! Can someone help me out with this?
https://www.lycoming.com/content/leaning-lycoming-engines
https://www.lycoming.com/content/leaning-lycoming-engines