Do you have an attorney? If so I would have the attorney draft up a letter stating what had happened and that this dealer was going to guarantee the car into perpetuity pertaining to any problems from their mistake.So far the dealer has been upfront and has stood behind their mistake. The have repeatedly said that they will stand behind any problems. On the other hand, I want and need a reliable car, I don't want to wait till the engine or transmission fails and then breaks down on the side of the road. I also don't want to find out that the engine or transmission has problems with longevity and I have to sink money into repairs, and or it keeps going back into the shop. I need to become educated with potential future problems. Do I need a new engine and or transmission?