DEF

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Rfg4retir

Member
Joined
Oct 27, 2017
Posts
19
Recently I discovered that DEF  has an expiration after a year, question is does this mean it will go stale in the tank if not in use if it does what does it mean to the system, or is there an additive you can put in it to refresh it or whatever?
I'm sure it's disgust in here somewhere it's just easier to re ask.
Thanks!
 
The quality degradation varies greatly with temperature.  It is a good idea to not buy excessive amounts, store in a cool place and only add when the DEF tank is rather low.  There are no additives that I am aware of.
 
It's probably not anything you need to be concerned about in the vehicle tank, but avoid buying large quantities that would need long term storage, especially in hot weather. You probably don't want to take advantage of DEF by-the-55-gallon-drum pricing.
 
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