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.
www.enthusiastauto.caNeed a car???
--'00 BMW ///M5 .:Jet BLK/BLK:.Individual- Modded
--'07 BMW M5/6.:Indianapolis Red
'91 BMW 850i J Spec Modded
'88 BMW 635CSi Lowered
'81 MB 500 SEC Koenig WILD RIDE