I'm looking for a TDI to replace my 2006 Vauxhall Astravan. I like the look of the Audi A4 estate but have heard about some issues with earlier PD engines. Are there any serious issues with the 2.0 CR engine that's in the 2005/6/7 Audi? My budget is less than £5000 and I'm not worried about high mileage, but DMF and DPF problems worry me as they can be costly.