I found out what my issue was and it's very embarassing .. took it to the dealer .. yes the noise was there .. seemd more at the front when I sat in the passenger side during a road test... get a call that afternoon... the front wheel lock nut was missing (!) and some of the other wheel bolts were loose causing the noise... I had it at the dealer in December for a service..I can only say that something happened then... and haven't touched the wheel since then... they replaced all the wheel lock bolts and did not charge a thing... btw i Had a X3 loaner 2.0d... wow I love my X5 even more now....