My wife's Avus M5 like to drink her expensive 10w60 oil quite frequently too. Not alarmingly frequently, but under what BMW considers "normal" for regular driving. (06/99 build date)
On the same note, mine, hardly burns any oil, no matter the driving. (06/00)
My e34 M5 burned very little, hardly ever needed to top it off between oil intervals (5-6K) and my e30 drank the shit.
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--'00 BMW ///M5 .:Jet BLK/BLK:.Individual- Modded
--'07 BMW M5/6.:Indianapolis Red
'91 BMW 850i J Spec-ST Tuning Kit- Lowered-Wokke Chips- Custom Exhaust- 18" MK1's-KN Filters+ M Steering Wheel- Stereo Upgrade +++
'88 BMW 635CSi Lowered
'81 MB 500 SEC Koenig WILD RIDE