I have a 2002 7.3L Diesel Excursion. It has an oil leak down the back of the engine. It appears to be diesel fuel and not oil. It is leaking out on the passenger side between the engine block and iol pan. It really got the tranny cover all full of oil and thought it was the tranny. But, had the tranny shop look at it and they said No.

Another shop thought it might be the seals between the blower and the blower base unit. Not sure what to think - any thougts?