I picked up a new S5 Sportback last Monday and I have a clunking noise coming from the rear. It happens at slow speeds over small bumps and is quite loud and VERY annoying. I removed the spare wheel, parcel shelves, jack & tool box. I also tried putting some padding under the spare wheel cover. None of this helped. So I took the car back yesterday and they put it on the hoist for a quick look but couldn't find anything obvious. They said they need the car back for a whole day to look for the source of the noise. I suspect it is suspension related. I have booked it in for 2 weeks time - the soonest they could look at it. In the mean time it has spoilt an otherwise perfect experience with my new Audi that I have waited a lifetime to get. I cant believe that this wasn't picked up before delivery. As soon as I drove the Audi technician 30 metres up the road he heard it. Doesnt seem like pre-delivery checks are done very well. has anyone else experienced this and do you have any suggestions?