I'll try to find proof of that. Usually not noticed until truck has run for one to two hours with some load. Worse with heavier loads, higher RPM....
I'm having the same issue! Mechanics find nothing wrong. What ended up being the problem?
I'm having the same issue. What did it end up being? By the way recirculation only partly helps. The truck still brings in some "fresh" air or...
I'm getting smoke in the cab on a Freightliner also- what ended up being your problem?