Quote:
Originally Posted by twindman
DEF shelf life is 12 months if stored under 86 degrees. Up to 95 it is 6 months. so mainly just don't buy it and stick it somewhere hot for a few months. Most parts of the country don't stay over 85 for long, so I would think just don't buy it at a gas station that has it sitting out side in the heat.
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That's just plain weird. I've read that same tripe many places. If that were the case, owning a truck in Texas or the southwest would subject the DEF to extremely high temps when it is "stored" in the vehicle DEF tank - even rolling down the hot highway or parking in the driveway for extended periods of time. So the entire south U.S. should be having DEF issues all summer long which can be 6 months long in some parts of the country.