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My dealer once told me to let the DEF run under the 1/4 full mark to allow the system to get rid of the old DEF. He said DEF is hydroponic (absorbs water) and allowing to run that low ensures you burn most of the old stuff before adding more. Maybe someone told you something similar
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Don and Kathleen
2019 Montana 3791RD 20th anniversary.
2014 Ram 3500 Dually CC, CTD, Aisin “Kasper”
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