Have you had a poke around underneath the car?
Where does the grumble come from? Front or rear?
Mileage on the car?
2007 330i M Sport Saloon Le Mans Blue
Active steering - Comfort Access - Bluetooth -TV - Heated Electric Memory Leather Seats - Auto - Logic 7 - Pro Nav - Adaptive Xenon Headlights
BMW Assist - iPod integration - Swirl free