I agree that the bottom of the M103 engine is well built. However, that has little to do with what could be WRONG with the engine. I understand that Michael is not the original owner of the car. If the oil was not changed very often, or if it was allowed to get low, any engine can cause premature wear under these conditions.

The last thing that should be done is to start replacing parts without investigation. The only way to properly investigate is to start doing exploratory surgery as Michael is now doing.

Good luck and please keep us informed as your investigation continues.