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Ok to top off DEF tank?
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08-12-2019, 01:22 PM
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artfuldodger
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Join Date: Nov 2010
Location: Chatsworth
Posts: 468
M.O.C. #10933
Yes DEF is 67 per cent water and it freezes around 16 deg. F. If your tank is full it could rupture during cold weather. Always, in cold temps fill to about 80 per cent.
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