Circumstances Search

Hello dear people, so far I only read with interest here. Soon my wife and I will be looking for a new used lookout. Briefly to the situation: Our Golf 6 1.6 TDI BMT (62500km) should be gone, update is done, checkbook maintained. We mostly drive short distances and mostly city traffic, the last news came that the DPF is full, I on the BAB, everything is good again. Before we have a really expensive damage to the car he will rather sell. Now k ommt my real question, a new one definitely comes here, but in what radius (km) would you search, we live in Nordhorn (48531) here is quasi no-man’s country, cheap used are almost only diesel. When would be the best season to sell the car or buy a new one. The car is running yes and we have still time. Thank you. Andreas