Yes, urea is found in urine - quit giggling, please - but this is a refined form of the compound and is mostly used in the agricultural industry as a component of fertilizer. DEF is made from deionized water and a very pure form of urea. That takes care of the "rolling coal" aspect of old diesel engines that made them relatively unpopular in the US in the 1960s, '70s and '80s.įrom the particulate filter, the exhaust gas travels past a nozzle which sprays diesel exhaust fluid into the stream of gases. So, in an SCR-equipped vehicle, the exhaust gas from the engine is routed first through a particulate filter to catch all the soot and ash generated from burning what is a relatively impure fuel. Filling up on DEF is as simple as popping the cap and pouring in a jug, but you'll do it a lot less often than you fill up your fuel tank.
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