2007 frightliner Coronado coolant problems

Head gasket? May be leaking into the cylinder and burning or seeping into the oil.

 

I have had excellent results from the local Stewart & Stevenson shop here in Albuquerque. I believe they're Detrot specialists - you're running a DD60 motor in that '07 FT:LR?

 

Do you have an egr cooler?

 

wen they rebuilt your engine, did they cut the counter bore in the block? if not the liner protrusion might be to low and the head gasket is leaking. a way to test is to get a empty soda bottle and tape it to the radiator support, and put the coolant overflow tube in the bottle and see if it collects coolant. or its a possibility that you may have leaking injector cups, and coolant is getting down in the combustion chamber and burning off. have you notices different color smoke, or the exhaust having a different smell?