Good evening, I have some questions about the Mercedes w123 and w124: 1. Are these models recommended as everyday vehicles? 2. How strict are the guidelines to get an H-mark? Would it be allowed, for example, to replace worn leather seats of the one model with identical seats with fabric cover? Should only colours be used when repainting, in which the car was delivered ex factory? Would retrofitting a parking aid be allowed? 3. Are these models relatively robust and maintenance-friendly, so that one can carry out simple maintenance work itself? 4. How high are the monthly insurance contributions for vehicles with H-marks? The insurance contributions for these old models seem to be very low anyway:http://www.autokostencheck.de/…/230-ce-123-c_14184.html