I found a car from 2014, 60000 km, from private for sale. In the pictures on the mobile.de, car has no license plate. I asked the seller if test drive is possible, and he said yes, the car has red license plate. 1) Isn’t it strange that a private person has a red license plate? should I pay special attention to something? 2) I have heard that there is a used car test by Dekra or ADAC. Which is better? Can the “KM manipulation”, “problem Find in the engine” or “problem in the gearbox”? Thank you