Never buy a pig in a poke. Make sure that the vehicle really exists. Absolutely inspect the car. Never only rely on the seller’s advertising – everything else would be careless.
Make an appointment with the seller to inspect the car, preferably in a busy place. To prevent misunderstandings, have a print-out of the vehicle description on you when you inspect the vehicle.
Make sure you thoroughly check the car. This includes a test drive on city streets at low speed and, if possible, on the motorway. Insist on taking a test drive. Some technical defects will only show while you drive. Take an experienced person with you when you test drive the car who might help discover any concealed or hidden defects, or tell you whether the car or the vehicle certificates were manipulated.
You best investigate the car during daylight hours to quickly discover any body or paint damage or repair work.
If it seems necessary, have an expert in Germany prepare a valuation report (at €250) or a status report (between €50 and €90). In addition to independent automotive assessors, you can get this service from automobile clubs, authorised dealers and free garages.