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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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