DEF fluid expiration?

All sorts of people are going to leave it sitting in their equipment that will sit idle for at least the winter. Farmers, dirt people, truckers, etc.

Bill

From DEF facts

16. What is the shelf life of DEF?
If the DEF is stored at ambient temperatures of 75 F with no major periods of exposure to heat over 86 F then the batch of DEF will last roughly two years. If a package of DEF is exposed to periods of heating the fluid will last approximately one year.

It’s not gasoline, so the topping off theory (also flawed when considering gasoline) does not apply.

One thing is for sure, you do not want to put bad DEF in it.

What till spring and top off with very fresh DEF.

I know the manufacturers say it has a shelf life, of course they want you to buy more DEF. But I have never heard of any actual issues with someone using old DEF. Lots of theories and warnings but I have never read of a documented case. It's urea and water and gets atomized into the exhaust. And are you going to drain the DEF in your tank in the spring? Isn't it probably just as old?

ScottG wrote:
One thing is for sure, you do not want to put bad DEF in it.

This

dalej wrote:

ScottG wrote:
One thing is for sure, you do not want to put bad DEF in it.

This

What happens? Do you have an example of using "bad" DEF? And how do you tell if it's bad?

ScottG wrote:
One thing is for sure, you do not want to put bad DEF in it.

I liked it a lot better when I didn't have to use any DEF.

eHoefler wrote:
What till spring and top off with very fresh DEF.

X2.
Reason : winter temps in ny. Store the new stuff in warm indoors.

From DEF website .
“Like many products on the market today, Blue Def does have a limited shelf life. But its shelf life is determined by the ambient temperature it is stored at and not its ingredients. To have a 3 year shelf life, Blue Def must be stored at temperatures no higher than 50 degrees F.”