Thanks for your feedback. I was hoping to find a rule, a law, a tax code that said something like "you can file x amount of years back". Maybe I'll just contact the IRS to be sure.

As for your vehicle, many persons would agree that if your yearly maintenance and repair bills are more than the annual payments on a newer vehicle then you should get rid of the old one and get the newer one. It simply makes more financial sense. However, if you have some emotional attachment to said vehicle, then there is no monetary value that anyone can place on it for you. No further details are needed to rationalize this.