The oil leak is normal, it's apparently just blow-by from the PVC valve and a common S55 issue..
Turbo leaking, but dealer says nothing is wrong
https://f80.bimmerpost.com/forums/sh....php?t=1545217
As far as the other issue, not sure why you have wheel hop but if I had to make an educated guess, I would say it's just the tire loosing traction due to colder weather, on summer tires..