02-18-2014, 03:09 PM
not only guarantee but alsow parts supply, you need to chouse the time you will still give suport for the car, but not a complicated way, you just have a screen that says you how many cars of that model there are in the roads and how many money you spend keeping the parts on sale and the profict you have from selling the partes, and when you tink that you are no longer having profit you stop the support, but if you make it to soon you will start losing brand image...