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Welcome to the M54. It's a design issue with seals inside the engine. You are having the same issue I put up with in a 330i we owned. There are a few things you can do to help reduce consumption but it will not go away. 1) CCV System or 2) M56 valve cover with integrated CCV 3) Catch Can. Others will chime in who are more knowledgeable on the subject. In my case we changed the CCV system which made it more like 1 QT/800 miles but then sold it a few months afterwards as I was tired of the inconvenience.
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