Have you encounterd the EGR mess from Hell?
I have been dealing with this issue twice in last 3 years.
Common problem of Ford Powerstroke 6.0L engines They either have or will develope EGR problems, the coolers and valves go bad sporadically.
Excessive heat passing through the EGR cooler can cause it to crack and fill your engine with harmful coolant resulting in catastrophic engine failure.
there are companies that manufacture a "EGR Delete Kit" that solves the power stroke porblem, in the end the best fix was to remove the EGR and fit this kit in its stead.
http://performancemachinemfg.com/c-235230-ford-6-0l-powerstroke-03-07-egr-delete-kits.html A kit is also available for the Dodge 2500/3500 trucks (2007 to 2011) Matt Henderson of Performance Machine & Mfg quotes
"Unlike other kits on the markit This kit comes with all the related parts and gastkets & o-rings to do the job"
"Trucks still pass the smog test without the cooler, you can expect a 1.5mpg increase in efficiency"
"If you add the Tuner you a can get as much as 4 to 5 more miles per gallon"
http://performancemachinemfg.com/