Quote:
Originally Posted by teoman
And another thing to consider, those diesel trucks are not always up to spec, I have seen some spew out black smoke for miles. Would not want to breathe that.
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If I were driving in a car with the air-conditioner turned on and recirculating instead of drawing fresh air from the outside, that would be not so likely to bother. OTOH that soot may eventually clog the cabin air filter anyway...