depending on the location of the DEF, it's probably not an uncommon accident to put diesel there instead.
In all our years and 85,000 miles and DEF fills with our coach, I've never had any issue with the DEF liquid itself, though some have warned that reports have been made that some will purchase DEF containers, use the fluid, then refill with water and return for a refund, as unused. The seal, though, if intact, should let you know that the new container you purchase has not been 'reused', if you know what I mean.
I always use the W*mt blue 2 1/2 gallon jug, with flex spout, and add an additional flex spout to refill my DEF tank by hand. I've maybe used an actual truck-stop DEF pump maybe once, until I realized that after filling my diesel, which has a fill on both sides near the front, I had to crank and move the coach 25' in order for the DEF pump hose to 'reach' my DEF tank, I decided not to go thru that process anymore - plus, if I remember correctly, I had to go back inside the truck stop and stand inline to either get a refund of overpayment if I couldn't pump as much as I already paid or was authorized for, or I had to go back in and do another reauthorization of the DEF pump, whatever....too much trouble.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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