DEF is used continuously at a rate that depends on the amount of NOx in the exhaust.
Regens do not use DEF. Regens use fuel. There are two different types. Those engines that are equipped with a particulate (soot) filter, inject extra fuel when the soot needs to be burned out of the filter.
Some engines do not have a particulate filter (primarily smaller off road), they only have 2 catalyst sections, the second one being where the DEF is used. In these, there can be a build up of crystallized urea. Once again, extra fuel is injected to heat the exhaust stream and clean the system.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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