I currently own a '85 190E 2.3 that has 243k miles on it. The only major thing that had to be changed was the heads. Other than that, it runs great. Of course, regular maintance has to be done. ( i.e. oil change, brakes, rotors, etc) I'm hoping that I can stack on another 250k miles before I buy another car. So if you own a '91 190E, I think you can easily hit 250k without much effort.