Compression Ignition Addict
Join Date: Nov 2008
Location: Tucker, GA
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Hold on, hold on. One thing at a time here.
Rinierd, a quick and dirty to see if your egr cooler is leaking is to park the truck slightly nose down overnight and pull the egr valve the next morning. If there's coolant pooled underneath it in the intake manifold then it's leaking. It is also a good indicator that your oil cooler is toast (plugged) because it is upstream with respect to coolant flow.
Have you had any white smoke on startup? Any white residue around the degas bottle cap?
Now, the coolant/oil temp delta test you did sounds light. One way to test is that the truck has to be warmed up thoroughly (20-30 min driving) and tested on flat highway at 65 mph until the oil temp settles. Another way includes some wide open throttle runs, the details of this one I don't recall but you can look it up.
Brownale, messing with the egr cooler or valve on an 05 and newer truck will probably throw a code but not in 03-04 trucks. Sorry about your melted engine but the oil cooler is not junk - something about the coolant or cooling system is junk but the oil cooler does its job well when it isn't clogged up with whatever crap clogs it over time. Do you have gauges or a monitoring device yet?
2014 F250 CC SB 4x4, 6.2, Platinum
2003 F250 CC LB 4x4, 6.0 w/auto (SOLD)