MY thinking on the Plug YOU pulled.......
The one right next to the Oil Drain nutted plug is another plug (allen internal) that will do the same thing, DRAIN the oil... Not meant for that though. It is the spot to put a oil temp gauge in.
The OTHER (allen headed) I think the Dr. is mentioning, is Under the motor and Drains the Sump area, and like DR. said,,, CAREFULLY used when changing out all the oil in the system... OR,
check IF engine is sumping (not needed to do UNLESS you suspect a problem in sumping):bigsmiley23:
You DO need to be careful Installiing ANY of the plugs in a HD,,,, Stripping out a Plug is easy to do and cross threading a Devils Bonus...:devil
signed....BUBBIE