Well, as I posted issues with my CLS regarding very sooty tail pipes and back bumper ( Yes its a Diesel ) and a good cloud when using kick down it's just cost the supplying Vauxhall dealer £600+ in parts alone. All because they wouldn't service the car before purchase, so I had it serviced by CVM in Preston ( Nothing but praise for these guys), full of information, happy to chat and didn't try and rip me off which is a rare thing these days. So after a few heated debates and armed with my list from CVM and a further inspection from the dealer its had the following: New Airflow sensor, 02 sensors, Glow plug No:2 Cylinder, O/S/F wishbone, washer bottle and a few parking sensors on the front replaced. I must confess, what a difference it's made having the 02 and airflow sensors replaced. All the sooty issues have disappeared and it goes rather well, not that it didn't before.