Originally Posted by Lilnuts2
Don't mean to question your observation. Are you aware the 7.3 is notorious for oil leaks in the upper valley and the oil drains down the back of the motor and can easily be misdiagnosed is a rear main seal or pan gasket leak.
Just thought I'd mention it.
Good to point that out Lilnuts2!
If that's the case a careful through cleaning of the engine block from the valley downward would be in order. While no where closely related the V10 & V8 Modular Motors have a head casting issue that caused an oil leak some often took as signs of a blown head gasket. Those leaks would be seen at the back of the engine on the passenger's side when the dog house was removed.
Just for grins what is the source of the oil leak coming from the upper valley on the 7.3 engines?