2003 F-250 5.4 115,000 Have been trying to track down a leak on the passenger side rear engine area for the past few months. Think it may be what everyone else is discribing as a head to block leak. You discription is identical to what I am finding

Was hoping it was the oil sending unit, but according to the repair manual that component is located by the engine mount

Is there a possibility that the head/s can be retightened or is this wishfull thinking