If the EGR isn't gunking up my intake then tell me why the back side of the valve and the hole that it feeds its exhaust into the intake was almost plugged on my 300SD when I got it. The turbo OUTLET was clear and the concentration of gunk was around the EGR port, not near the turbo outlet/inlet side of the intake manifold.

I disabled my EGR and have reasonable blowby. 25k later there is NO gunk. There is light oil but no more thick gooey sooty crap.

And if its coming from the crankcase ventilation system then why don't interoolers plug up every 50k? It would seem like they would be seeing the same "hot side of the turbo" oil problem that the intake was seeing.

EGR cools the combustion yes...but it also contributes to the intake being filled with