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Diesel fuel winterizing is something I have never bothered with. The additives that purport to prevent growths etc work. But where I live it's pretty rare that any significant growth will happen where it gets 35 below. I usually just make the tank as full as possible then as long as I can reach it bag the vent with a white shopping bag and a rubber band and seal the filler the same way to prevent moisture and condensation accumulation. And as I am forgetful I put a sign over the ignition lock so I will remember to remove my winterization stuff before starting. Good Luck