Ending costs for the maintenance of a US car

Hello, there are numerous topics about how much you have to pay when you import a car from abroad, especially from the USA. Since I find nothing right at maintenance costs, I ask here. I have been dreaming about my own Ford Crown Victoria for a long time. I can save on shipping costs if I buy something from one of the entire US military bases in Germany and therefore only have to pay import costs. A civilian police version, which I want to have, I can do it but l In any case… import costs are known. But how about the maintenance? You pay taxes and insurance fees during registration. In addition, you have to refuel and regularly for inspection. Maybe buy spare parts. Can someone tell me, maybe even the owner of a Ford Crown Victorias Bj 1997-2011, how much money you spend on the car on average per month and whether you often have to import spare parts during maintenance or the resulting shipping costs. Is the price difference enormous or acceptable? In a few weeks my training is finished and I would like to start with the start of my professional life immediately, so that I can buy the car soon at last. Of course as a second car. But then the car should not become a price hell.