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All fuels and def take their suction from the bottom of the tank. Each liquid has it’s own specific gravity, so it’s not layering like oil and water when new fuel/def is delivered. Tanks also have agitators to alleviate separation. Now, a small percentage of what you get “could” be day one fluid due to mixing. I wouldn’t be too concerned. Stuff that’s on the shelf has a higher probability of getting old. Typically it’s cheaper at the pump as well. I would go for that…
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