I have a 2006 6.0 the truck has been Bulletproof. The truck has had 4 new oil cooler in the past year. It just got serviced at a performance shop. The truck has just about every thing new from performance heads egr aluminum radiator fan clutch fan injectors gaskets wicked wheel icp and on and on. I noticed when I run 75-85 mph or faster the truck start blowing out coolant from the resivor. I don't know what to do with it tonfix it. Any ideas or should I just shop for a new truck ?

 

It sure sounds like you've got a head gasket leaking again. Did the place that did the Bulletproofing guarantee their work?

 

yes they do guarantee the work. The truck has been at the shop for two weeks and they can't figure out why it's blowing coolant.

 

Have they put a pressure gauge on the degas reservoir yet? First thing to know is whether or not the pressure is exceeding the cap design or if coolant is blowing at lower pressures. Make sure your coolant concentration is at 50% and that the level (cold) is at the minimum mark on the degas bottle.

Also, what are your coolant and oil temps getting up to?

Lastly have all 4 of the oil coolers been aftermarket?