Most trucks have a DEF heating system to keep the truck running in extremely cold weather. DEF has a freezing point of 12 degrees Fahrenheit, but since both urea and water freeze and thaw at the same rate, it’s okay to use if frozen and thawed. Despite marketing names such as AdBlue and Blue DEF, it’s a clear liquid with a slight smell of ammonia. DEF is slightly heavier than water at 9.08 lbs. Removing the body is actually a rather simple operation, provided you have a lift.ĭiesel exhaust fluid (DEF) consists of 32.5 percent high-purity synthetic urea and 67.5 percent deionized water. This is essentially how Ford builds the truck the frame assembly is mated to the body assembly on the line. To service the entire fuel system on a Ford, it’s much easier to raise the body to gain access to the all the fuel systems parts. (This, by the way, is why we prefer GM’s setup, which puts the DEF tank under the hood.) Someone who’s used to the routine of opening the fuel filler door and removing the fuel cap could easily have a lapse of concentration and put DEF in the fuel tank-a simple mistake that could send a truck to the scrapyard. A diesel fuel nozzle won’t fit into the DEF filler, but there’s nothing to stop someone from pouring DEF into the fuel tank. 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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