I posted this an hour ago under the Model S Technical / Mechanical Issues #3117, but a general post about the service experience seems appropriate in light of Tesla's decision to not look at this from an engineering standpoint but rather to just deny goodwill, swap out the part and move on. I hope I'm not the canary in the coal-mine, but my rear subframe sheared apart at the rear connection to the drive train. I do drive a lot, so my 2012 P85 is approaching 170,000. That said, I have never thought of frames as a "wear and tear" part. Nonetheless, Tesla service apparently does and decided that I should pay $2035 to have it replaced. I am beyond frustrated. There was no collision, no bottoming out, no drama. I was just backing out of a parking spot and I hear THUNK THUNK THUNK. Upon diagnosis at the service center, I told them to explain the situation up the line and request the repair be done on a goodwill basis. I know my mileage is high, but this is not a water pump. It is a FRAME FAILURE. It is the structural skeleton of the car and it should not wear out. The stresses from the motor are known and the engineering should be correct on a part like this. There had to be some sort of materials defect or heaven forbid an engineering defect. Frames don't just break. The only other idea that has come up is that they may have over-tightened the mount and created the stress when they swapped out the drive train a few months ago. The only analogy I can find is the BMW E46 3 Series where the subframe was pulling against the unibody and causing cracks in the body. Guess what BMW did. Ten years of goodwill repairs regardless of mileage and design changes to stop the issue. In my case, they were just planning on sending the subframe off to recycling and moving on. I would really appreciate any advise on how to proceed or get this escalated to someone who cares to take a considered approach. Thanks, Andy You can see another view in the original link, but here is a closeup of wear the metal sheared away.