

Whaaat?! What had happened?
Oh, okay. I'll have to do that. Thanks a bunch for the advice!You could drain the oil and coolant, then dump some old oil in the motor to actually run the car and see if the noise stops or is actually a rod knock from a spun bearing.
Having no coolant in the motor here will help because now nothing can mix with the oil. You can run it with no coolant for a few minutes without worry, it will take longer than that for the oil to get too hot and do damage.