One problem related to wiper has been reported for the 2015 BMW X3. The most recently reported issues are listed below.
The rear lift gate window is permanently tinted dark. This makes driving in cloudy, rainy, low visibility and night time very dangerous by greatly reducing visibility thru the rear view mirror!! also, the auto-darkening feature of rear view mirror at night makes it even worse!! this should be a clear window. Talking to local BMW dealer was of no help.