Stale DEF
Because of Covid my F-350 6.7 diesel has been garage kept since February. The DEF tank is full. DEF has a shelf life. Should I be concerned enough to consider draining the old DEF? My first diesel. T...
Forum Discussion
It’s probably OK, but you can get on Amazon and buy an inexpensive refractometer that will tell you if it still has the correct 32.5% urea. Some refractometers can also check multiple fluids, like antifreeze, windshield washer fluid, DEF, and battery acid.
Diesel Exhaust Fluid doesn’t degrade nearly as quickly as people assume. For example, at 86°F, DEF has a shelf life of a year. But, don’t equate shelf life to spoiling like food, as DEF will not “go bad”. It will lose some effectiveness, and the SCR will dose at a higher rate, but it won’t “go bad.” If maintained at a constant temperature, DEF manages to stay good for several months. For example, at 74°F Diesel Exhaust Fluid has the shelf life of 44 months.
:):)
Diesel Exhaust Fluid doesn’t degrade nearly as quickly as people assume. For example, at 86°F, DEF has a shelf life of a year. But, don’t equate shelf life to spoiling like food, as DEF will not “go bad”. It will lose some effectiveness, and the SCR will dose at a higher rate, but it won’t “go bad.” If maintained at a constant temperature, DEF manages to stay good for several months. For example, at 74°F Diesel Exhaust Fluid has the shelf life of 44 months.
:):)
