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You all can buy all the DEF you want and store it but just remember there is an expiration date on the boxes and it will go bad. Just ask me! I had a DEF problem several years ago and it cost me over $10,000 total to take care of the problem. This was over a one year period but he final straw that broke the camels back was while in AZ and the bill was over $4000. The dealership could not figure out the problem and finally called in the GM engineers for help. It ended up by the dealership replacing the complete exhaust system and all the sensors. I was told there IS a difference in the DEF you buy and that the one to purchase is the Peak Blue DEF. I've been purchasing that whenever needed and keep a jug of it as a spare while traveling. I have traded the truck in that cost me all that money and have been using the Blue DEF only in the new truck. No problems and knock on wood we won't have to go through that ordeal again.
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