DEF is used as a catalyst for the Catalytic Converter to remove NOx from the exhaust stream, unlike gasoline engines, the exhaust stream on a diesel isn't consistently hot enough to allow the catalytic converter to do it's job, that is why DEF is added. Also the amount of NOx in the exhaust is a function of the how hard the engine is working and this means the amount of DEF required varies. There is also a requirement to not allow excess DEF (ammonia) pass through catalytic converter.
That is to say that the amount of DEF varies depending on load and is not directly tied to the amount of diesel consumed or miles driven.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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