From which part of the turbo?
Plus anything leaking the most vital fluid in an engine isn't normal. A bit of oil getting past the rings, or some oil getting past the turbo seals as they age and are being used is justified.
It's not like BMW has had issues on these turbos, or they've had to replace a bunch, or that they fail prematurely on a factory tune which they addressed by lowering the boost...
Also, they get paid for the warranty work, so what do they care.
2016 e63 amg s wagon matte white
2012 bmw m5 JB4+BCM