My recent "Toad" experience

I have collected vintage cars my entire life and have never had a oil pan plug wear out or break. If they have been doing the oil changes over the years then the have been over torquing the plug. My guess the plug has a copper or O ring seal which has worn over the years and was weeping oil. They kept pulling down on it to try to stop the leak. If you want to make the manger squirm look up the specification for the torque to which the plug is to be tightened to and ask him what it is in front of a witness. He will have no clue. You could also as to inspect the torque wrench they use and when was the last calibration date.

Jim