Also, diesel engines have problems with carbon buildup over time, which reduces the combustion efficiency and causes the notorious black clouds of soot. (http:/

Also, diesel engines have problems with carbon buildup over time, which reduces the combustion efficiency and causes the notorious black clouds of soot. (http://www.bellperformance.com/bell-performs-blog/blog/carbon-buildup-in-diesel-engines http://www.bellperformance.com/bell-performs-blog/blog/carbo...).