I was about trade in my 19 plate 3 series for a new shape CLS 400d at an independent last Xmas. One owner (ex Mercedes Benz) with 9500 mile on the clock. As it was an expensive purchase I decided to sleep on the deal, and overnight decided to take a look at the car in greater detail. It was due a B service, according to the MB website at £600, and the rear tyres were down to 3mm. With this in mind I asked for a MB Service and new tyres to seal the deal. They said no, they would be doing the service themselves ( Malcolm Waite Ford in Sandwich) and the tyres were legal so would not be replaced. Needless to say I was not prepared to pay £39k for a Mercedes with no MB service history and needing £600 in new tyres and walked away. Ten months later my 3 series in worth nearly £5k more than they offered in part ex according to Autotrader but 18 month old CLS 400d are selling for nearly ten grand more.