Ok to top off DEF tank?
For some forgotten reason, have a hand written note in the diesel manual for my truck saying do not top off DEF before the 999 mile before reduced speed warning on the DIC. Leaving on a long trip with Montana and thinking of adding DEF before we leave. Know to be careful and not allow overflow! Yes, I wrote the note several years ago but not sure why! Manual and internet search didn't find anything. Thanks,
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2017 Montana 3611
2012 Chevy 2500
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