Filling The Def Tank In Cold Climates - Dodge RAM 1500 2018 Diesel Supplement

3. Stop filling the DEF tank immediately when any of the
following happen: DEF stops flowing from the fill bottle
into the DEF tank, DEF splashes out the filler neck, or a
DEF pump nozzle automatically shuts off.
4. Reinstall cap onto DEF tank.

Filling The Def Tank In Cold Climates

Since DEF will begin to freeze at 12°F (-11°C), your vehicle
is equipped with an automatic DEF heating system. This
allows the DEF injection system to operate properly at
temperatures below 12°F (-11°C). If your vehicle is not in
operation for an extended period of time with tempera-
tures below 12°F (-11°C), the DEF in the tank may freeze.
If the tank is overfilled and freezes, it could be damaged.
Therefore, do not overfill the DEF tank.
Extra care should be taken when filling with portable
containers to avoid overfilling. Note the level of the DEF
gauge in your instrument cluster. You may safely add a
maximum of 2 gallons (7.5 Liters) of DEF from portable
containers when your DEF gauge is reading ½ full.
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