When to Keep? When to Let Go?

In the car maintenance business, we have a built-in bias to hang onto cars and fix them up. We admit it. Nevertheless, there are times when that's simply not the smartest idea. We try to be candid and say when enough is enough — in case the owner hasn't already figured that out. But then, not every car owner who has that special human-to-machine bond hears us when we approach this subject. So here are a few guidelines which might help if you are pondering whether to keep or let go.