My 2006 318ci convertible has 40,000 miles on the clock. When I engage and come off the throttle there's an audible, put not loud, clunk from the rear. It's noticeable at low speeds, probably due to lack of other noises, and I'm not sure if it happens at higher speeds. Everything else about the car is perfectly fine and it has recently been serviced. The people at the garage said it was probably the prop shaft or diff - but didnt seem at all keen to look into it.

Am wondering what people's views are, and how important it might to follow-up on.