Quote:
Originally Posted by Doug Brown
DEF has a very short shelflife. Make sure were buying it at places like Walmart or they have a high turnover. I would say the truckstop DEF is one of the freshest deaths you can get I am not afraid to buy it there never had a problem.
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The shelf life of DEF is determined by how it is stored. It can be as long as only a year, or as many as three years. It all depends on the heat it is subjected to.