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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
... [Read Article]
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