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I stumbled upon the Technical Training Manual for the SCR2 and it seems that the DEF we have been putting in there may have changed the long term adaptations outside of the programmed tolerances. We have not been using the AdBlue brand lately but filling up from a DEF pump. Basically, the one we have been using may not have the same mixture as AdBlue and is not as efficient at converting the exhaust as AdBlue.
I don't know if I can drain the DEF tank, but I may try that and refill with AdBlue.
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