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Re:VW Scandal Will Speed Up Diesel's Demise by X-Istence on Monday October 05, 2015 @03:28PM (#10334196)
That's not due to poor maintenance in a lot of cases these days.

Google 'Rolling coal'.

Re:VW Scandal Will Speed Up Diesel's Demise by ansible on Tuesday October 06, 2015 @01:29PM (#10340635)
Sigh. I didn't know that was a thing. How obnoxious.

Anyway, mostly it is construction and semi trucks I see blowing black smoke. Usually they are really rusted out anyway, hence the lack of maintenance comment.