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Diesel Truck Maintanence
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01-13-2019, 12:16 PM
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bsmith0404
Senior Member
Join Date: Mar 2014
Location: Las Cruces
Posts: 4,665
They say Def is good for up to two years, I just wouldn’t recommend letting it get old. No reason to fill it if it’s going to last a year. Use smaller quantities and keep it fresh
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