This month marks the 10th anniversary of the American Petroleum Institute’s voluntary program for certification of diesel exhaust fluid‘s quality. Essentially, the program is modeled on the API’s ...

Diesel Exhaust Fluid (DEF) is made from a mixture of technically pure urea and purified water and must be handled and stored properly to preserve its quality. This is true for drivers filling up on ...

Adding diesel exhaust fluid to a truck isn't the big deal some thought it would be when selective catalytic reduction first came on the scene. But DEF quality can still be a big deal. Adding diesel ...