There's one more source of a leak that hasn't been mentioned yet- - - - -the core plug at the back of the engine behind the camshaft. That's a pretty unlikely situation, but I've seen it happen on occasion. The most common leak is the rope type oil seal at the back of the crankshaft, just ahead of the flywheel. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!