Kind of a comical intro, But a serious problem! Sorry this forum seems more appropriate. 2008 superduty 6.4 not modified. Now here goes the problem, truck runs fine no temp issues. Never runs beyond halfway. Put a load behind it 4500 lbs (airboat) take a short drive on the interstate 75mph in 10 miles it will puke all over itself still never running hot. Will loose a gallon to a couple of gallons. Now as far as i know a truck should build boost going up hills, it losses boost. all verified by truck service manager. Ok they have replaced the coolant hose to the egr cooler, the radiator, the egr housing and the egr itself, the horizontal egr cooler, the thermostats, the intercooler. O-ring on lower radiator hose has shown signs of a leak, but wont leak under their tests. Still puking after all this. The radiator is the second one installed in the truck. The other day i took it in for check engine light and the egt temp sensor was bad had to replace up-pipe and sensor. Asked if they would check the puking issue again, kinda got the run around. Drive it and see what it does was my answer. By the way I'm getting real close to my 100,000 mile mark. Any ideas before I'm on my own. Any ideas as to the root cause?

 

Head gaskets would be my guess.....

 

Yeah that points to headgaskets. Think they need to check that.

 

The simple thing would be the degass bottle cap. If both EGR coolers where replaced there is a slight posibility the oil cooler could be pluging up the oil flow causing high oil temps and the coolant to flash boil ive seen that cause the degassing as well. After that id say headgaskets

The turbo issue could be seperate all together. The high pressure turbo could be failing.