But even trucks that require DEF are not immune from potential problems: Ford and Ram put their DEF filler necks inside the fuel filler door, right next to the fuel filler. The truth, of course, is that DEF is only useful in a rig with a DEF system, which consists of a separate tank, filler cap and fluid lines as well as a specialized exhaust system. Also to blame: well-meaning service station attendants, techs at non-diesel shops, and even owners of gas rigs hoping to reap the benefit of increased fuel economy. We’ve heard stories of vehicle owners who think that if DEF is so good for new diesel trucks, it should be good for their older diesel as well. Typically this happens when someone pours DEF into the fuel tank on older diesel rigs. Used properly, DEF is a good thing-but used improperly, it can cause serious (and seriously expensive) problems.Ī quick Web search will turn up numerous (and, to some, humorous) tales of folks putting DEF into their non-DEF trucks and cars.
Back in the September 2014 issue of Diesel World we talked about diesel exhaust fluid (DEF), which is used as an exhaust treatment in modern diesel emissions systems to reduce the levels of nitrogen oxide (NOx) in the exhaust.
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