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4season · August 9, 2019

OK, further reading. Diesels are set to run lean so there is no soot, however this leads to nitrogen oxides in the exhaust. With SCR, selective catalytic reduction, the urea reacts with nitrogen oxides so that fewer are released.

August 9, 2019	#8
4season Tomatovillian™ Join Date: Aug 2014 Location: albuquerque Posts: 308	OK, further reading. Diesels are set to run lean so there is no soot, however this leads to nitrogen oxides in the exhaust. With SCR, selective catalytic reduction, the urea reacts with nitrogen oxides so that fewer are released.