Hi Kim -
Thanks so much for being a valued customer at Bimmer Car Care. We didn't notice any sounds that are abnormal at the time of the test drive. We are committed to keeping our customers satisfied, so please let us know when you can bring the car back to us and we can look into this sound you are describing. Feel free to call us at 312-794-5030 or email email@example.com to get this scheduled for you.
Thanks so much for your business.
Bimmer Car Care