Quote:
Originally Posted by rohrmann
DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
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Agree. The supposed “premium” DEFs claim to reduce or eliminate DEF crystallizing and build up in the exhaust system. But the only place I have ever seen any claims of that being a problem is in the advertisements of the manufacturers that sell a “premium” grade DEF. And even if true, that would happen over time, not between tankfuls of DEF (according to those manufacturers).