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Discussion Starter · #1 ·
Living in Maryland, temps do get down in the 20's and sometimes lower. I don't drive the truck that often and I'm wondering if it's ok to winter the truck with 29% DEF remaining or should I top it off. I'm thinking it's better to run out the older fluid before refilling and contaminating it with the older fluid.
 

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Trying to find it at the pump around here is tough unless you are a semi truck.
 
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