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Old 11-07-2013, 10:35 AM   #1
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DEF storage?

This is our first year with a diesel that requires DEF. Can't find any recommendations in the owners manual about 'winterizing' DEF. I always treat the fuel tank to make sure the diesel doesn't gel but what about DEF?
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Old 11-07-2013, 10:40 AM   #2
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I believe it is composed of mostly H2O. If so in consistant day after day of freezing temps it will freeze. Sure others with greater knowledge will chime in.
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Old 11-07-2013, 10:45 AM   #3
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Quote:
Originally Posted by Craigls2 View Post
This is our first year with a diesel that requires DEF. Can't find any recommendations in the owners manual about 'winterizing' DEF. I always treat the fuel tank to make sure the diesel doesn't gel but what about DEF?
No special treatment needed, it will not go bad just sitting for a few months. The tank is near the engine so it gets residual heat and DEF has a fairly low freeze point anyway.
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Old 11-07-2013, 10:48 AM   #4
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Found this on several web sites;

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Q. When will DEF freeze ? A. This 32.5% solution will begin to freeze at 12 deg F (-11 deg C). At 32.5%, both the urea and water will freeze at the same rate, ensuring that as it thaws, the fluid does not become diluted, or over concentrated. Unthawing will not cause harm to the product.
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Old 11-07-2013, 11:13 AM   #5
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Thanks for the help with that. The motorhome is put to bed and won't be reactivated till the end of April. Good to know everything will be fine when we started up again in the spring.
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Old 11-07-2013, 11:23 AM   #6
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Glad I saw this question.
We re going to be in the same boat as we are looking at a 2013 Berkshire and its going to be a new learning experience for me so I'm sure I 'll have plenty of questions.
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Old 11-07-2013, 04:51 PM   #7
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DEf expands about 7% when it freezes, though, so it could conceivably crack the tank. Cummins says the DEF tanks are designed to allow for expansion, but I would want to leave some extra room if it was going to be unheated for months at a time.

http://www.cumminsfiltration.com/pdf...es/MB10033.pdf
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Old 11-09-2013, 02:35 PM   #8
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Thanks Gary. I'm at a half tank and will leave it till spring.
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