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.
AR Resonated DPs, Line Lock Kit | HPF FMIC | Forge DV's | BMW PE | BMS DCI, OCC, JB4 G5 | Meth
Still todo: Wavetrac LSD, Suspension bits