[W126 Coupe] Leaking oil--Dealer baffled??

[mavris2 at comcast.net]

Don't know if anyone can help.  But on my 87 420sel, there looks like a "weep" hole on the drivers side of the engine.  The location is toward the rear of the head about 2-4" down just in front on the bell housing.  I can get my pinky finger in the hole.  It does not appear to be threaded.  This is where the oil is coming out from.  It leaks with the car running and with the car off.   I have attached a photo. Maybe someone can shed some light on what goes in there ???    




Jason 
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