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Not sure how far improvements have come but I was told in 2012 to adhere to a 4 month life cycle. Manufacturers base the DEF tank size on a given vehicle to the anticipated use/mileage so as to keep it flowing and fresh under normal use. Many RV's are sitting around on dealer's lots with this stuff going south. Best to fill it asap and manage it going forward. Filling will always refresh what's there. You won't know its bad until you get a "bad fluid" light or the filter gets plugged...both of which will put you down within a few hundred miles or less. Another amazing fact...it's mostly water.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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