I am 54 years old and retiring from my job which has earned me a pension next month. I have never owned a new car or even a particularly nice car before, so I would like to get something nice. I am looking at a new or slightly used BMW X5 which runs about $60,000. I would probably buy it even if I wasn't going to Uber. The question is am I crazy to use a brand new BMW to Uber for some extra cash and something to do in retirement?