For whatever reason, my left front axle nut came loose and trashed my left front wheel bearing. I don't know how long the axle nut was loose, but I kept hearing weird noises for a long time. Finally I lifted up the car and shook the wheels. Left front had lots of play. I installed a new axle nut and new front left hub assembly. It's probably a good practice to check your wheels for play ever so often, but if you use ramps to change your oil, you might miss the opportunity.