Forum Discussion

3ares's avatar
3ares
Explorer
Jan 12, 2017

DEF storage

I know there is a heater in the DEF tank of my Ford. If the DEF fluid was to freeze while in my toolbox, could it be safely used after thawing out?

Thank and Happy Travels
  • It probably freezes in the back of a trailer when its being delivered to stores in the north and midwest in the winter. I think it'll be just fine =)!
  • agesilaus wrote:
    Turtle n Peeps wrote:
    It's fine to use DEF that has been frozen. Just thaw it out and pour it in. :)


    Ditto on that and freezes at a relatively high temp too.



    Negative ghost rider 12*f is not a relatively high temp
  • 3ares wrote:
    I know there is a heater in the DEF tank of my Ford. If the DEF fluid was to freeze while in my toolbox, could it be safely used after thawing out?

    Thank and Happy Travels


    yes. In fact if you live in cold climates, it will likely freeze almost every night and then get thawed by a heater when you start the truck. DEF freezes around 12F.

    In fact freezing is pretty much a non issue. Now storing DEF for a long time at high temp is. It's "shelf" life decreases with ambient temperature. much above a constant 100F starts to decrease it's shelf life noticeably.
  • Turtle n Peeps wrote:
    It's fine to use DEF that has been frozen. Just thaw it out and pour it in. :)


    Ditto on that and freezes at a relatively high temp too.