Well Part of the used car deal, I think serious tun-ups for used cars should be more involved than a new car, like as the car gets alot of miles etc.. you need to replace the engine or something, or buy nwer parts, so it the tranny goes bad, you need a new one, or a clutch etc... Being able to sell your car back to the used car lot so this way you could look around and see which lot gives you more money, and oh while there add it the value should go up and down depending on how many new parts you put on the car (for example a car with bad tranny will cost 3,000, but replace the tranny and your car sells for 4,000 or whatever) you all get the picture, the more miles you put on, the less the car value is... Being able to adjust your car between races in a 10 race series is a must, adjusting tires, changing oil, washing the car, changing parts/ buying new parts etc... This way you could keep your car in top shape for every race..