So I just recently acquired an 04 automatic 40th Annv. Mustang and today when I got under it after driving , the plug was wet with what appeared to be oil. I wiped it down, drove another mile or so & there was only a little (maybe the eq. Of 3 drops) around the plug.
I searched a little and read that it could be:
Oil pan leak
Valve cover gasket leak
Rear main seal
Possibly a leftover mess from a sloppy oil change?
From what I've read, wouldn't the leak be a lot worse if it was from the rear main seal?
Are there any other possible causes for this small leak? And how could I figure out where exactly the leak is coming from myself?