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I used to have a box of BLUE DEF with me from Tractor Supply but now that Flying J, Pilot and many others have it at the truck pumps, I usually fill it up once a month by going through the truck lane. DEF is sensitive to heat and can spoil and go stale. My Ford Service Manager recommended not to keep it in the truck hauling it around for a long time in the hot summer heat. It has a shelf life. Pump filling is easiest for me unless our journeys are taking us more rural, I still carry for the safety of having it.
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