A diesel BMW of this age could prove to be quite expensive to run. High mileage is a good thing, though – it means it's likely to have been used for lots of motorway journeys and the diesel particulate filter (DPF) will have been kept clear. Problems occur when diesels are used for regular short journeys and the DPFs become clogged. That aside, I'd want to see evidence of regular servicing (receipts as well as a fully stamped service book). You'll have to accept that running costs will be more than a Ford Focus, too. This should give you an idea of common issues: www.honestjohn.co.uk/carbycar/bmw/5-series-e60-200...d