I'm thinking about not changing the pipe of the fittings in #1. I agree that oil blow off from the turbo won't pool oil onto the pan. It'll splatter on the underbelly cover. I wiped the belly cover's top side, and while it was greasy, it's dried oil, meaning it's not a significant leak. I'll just chalk this up as part of a turbo car ownership.
Regarding #2, if I'm pulling the sensor to get to the gasket, I'm dumping the entire 7.5 bottles of oil out of the pan. That's about $56 of oil. I feel like if it's truly the area of the leak, shouldn't I just change the sensor too?
2014 F06 M6 (oil rig fire)
2012 E70 X5 diesel (oil burner)
2008 E90 M3 (oil distillates guzzler- Retired)
2013 bicycle (oily chain)