So I bought this truck with a Cummins ISX 485.
Turns out that it emits copious amounts of white smoke which smells of coolant:
However, I noticed that it only seems to do it at idle, if I push the gas pedal hard, the smoke disappears temporarily.
I first suspected blown head gasket. After some thinking, I started suspecting that perhaps this is a leaking EGR cooler, since EGR is used when the engine is not loaded? Any thoughts?