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Old 01-08-2015, 10:16 PM   #1
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Damage to DEF tank due to freezing

I've been reading the DEF will freeze around 11-12 degrees and the tank will be fine if not completely full. I've always heard that ice expands equally in all directions so I was wondering if a DEF tank can be damaged while setting in freezing temperatures even if only 1/2 full? I understand the tank has a heater prob that works when the engine heater is on but this is usually not the case all winter. This situation could occur while winterized for several weeks and not driven. Will the tank still survive?

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Old 01-09-2015, 05:22 AM   #2
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Here are some links that may help you out.

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Old 01-09-2015, 07:23 AM   #3
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Something to think about.....

There are thousands of different elements and solutions and compounds here on the planet Earth..

Question:How many of them expand when they freeze?

Answer: ONE,, yes, just ONE,, Water

PINK stuff, for example (RV antifreeze) Freezes very easily,, it just does not expand, thus it does not blow tanks up.

Truck drivers have to have DEF tanks, and often find themselves far colder than -11 out.. I mean I personally have walked around in -40 (but that was before DEF), I would not worry about it.
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Old 01-09-2015, 04:22 PM   #4
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From all that I've read, DEF expands by only about 7% when frozen and manufacturers have taken this expansion rate into account when designing the tanks that hold the fluid. I suppose from a theoretical standpoint, if you store the coach with the DEF tank filled right up to the cap, that it may have the potential to crack the tank but how many will have their DEF filled past the fill line before storing the coach for the winter? Personally, I believe it's a non-issue.
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Old 01-09-2015, 04:39 PM   #5
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Had our DEF tank 1/2 full last winter and with the Polar Vortex -0 temps for days on end and no issues.
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Old 01-09-2015, 06:55 PM   #6
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If freezing was a problem, trucking companies would be making it known.
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Old 01-09-2015, 07:03 PM   #7
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I've read on Peak (major maker of dEF) that DEF does not freeze hard, but merely turns to a slush. I doubt this would result in cracking the DEF tank.

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