There are anti gel additives to add to your fuel that I'd recommend in cold temps, but DO NOT add anything to the DEF except maybe a warm garage.
Mentioning fuel additives, if storing or your diesel coach or is parked idle as a snowbird home I'd recommend an additive with a bacteriacide into the fuel, diesel does have a shelf life & this will help keep it fresh til rolling again.
I'd add some type of fuel stabilizer, StaBil or SeaFoam, to the full gas tank, always store with a full tank, on a gas motorhome while parked for extended periods.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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