As a BMW tech once told me, these cars burn oil like they burn gasoline. Very normal and not limited just to BMWs...I've put about 2500 miles on my Pana and added a quart of 0W40 to the engine last weekend. My advice: research the recommended oil for your vehicle then go to Amazon.com and purchase a case to keep in your garage.
Currently: 2015 Porsche 911 GTS and 2016 Cayenne S eHybrid
Past BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport; `15 M235i convertible
Others: '11 Panamera 4S; '13 Boxster S; '13 911 C4
"You think that's air you're breathing now?"