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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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