I'm experiencing the same thing. About a quart every 7K miles. I've run Total Quartz INEO MC3 5w-30 (LL04) and GC 0w-30 (LL98) with GC 0w-30 being the longest I've run any oil (10K+ mi). I'm going to be switching to Total Quartz Energy 9000 5w-40 (LL01) next weekend. I ran that in my E39 2.8 M52TU motor and never burned a drop in between 7500mi drain intervals.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean