There are a lot if misconceptions about Diesel Exhaust fluid, even in the heavy Duty trucking world, as all engines in 2010 will use SCR/DEF to lower NOx to the new EPA/CARB standards.

Here are a couple of links that have some good information (from a trucking perspective) that may help all understand what DEF is and does.

Diesel Exhaust Fluid (DEF)

Diesel Exhaust Fluid | Facts About SCR

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