Good Sam Club Open Roads Forum: DEF how old is too old?
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 > DEF how old is too old?

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2oldman

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Posted: 07/07/20 03:21pm Link  |  Quote  |  Print  |  Notify Moderator

From google:

"Storing DEF in a cool, dry, well-ventilated place is recommended to maximize shelf life. It will degrade over time, but if stored at temps between 10 degrees and 90 degrees, DEF has an expected shelf life of one year. You can extend the shelf life to two years by storing at a temperature that stays around 75 degrees."

BurbMan

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Posted: 07/08/20 05:42am Link  |  Quote  |  Print  |  Notify Moderator

Having just bought my first diesel, I'm new to this DEF stuff and you got me wondering. Here's how to read the date code on Peak Blue DEF

[image]

Note that the year noted is the Expiration year, the year of manufacture is actually one year prior. So if your DEF is showing 2019, it was actually made in 2018 and is DEFinitely too old to use. [emoticon]


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dodge guy

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Posted: 07/08/20 05:44am Link  |  Quote  |  Print  |  Notify Moderator

Dump it. Def has a shelf life. If it's stored in a cool place out of sun it's good for 12 months. If it's stored in direct sunlight then 3 months.
The key is in how it's stored.


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Lynnmor

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Posted: 07/08/20 07:42am Link  |  Quote  |  Print  |  Notify Moderator

I would question the age of the DEF that is already in the truck, perhaps the DEF in the jug is better.





otrfun

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Posted: 07/08/20 08:29am Link  |  Quote  |  Print  |  Notify Moderator

DEF's shelf life varies by temperature:

<50 deg, ~36 mo.
50-77 deg, ~18 mo.
78-86 deg, ~12 mo.
87-95 ~6 mo.
96-104 ~2 mo.

If you live in southern AZ probably should refill with limited amounts of DEF unless you drive a lot.

Learjet

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Posted: 07/08/20 10:14am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

If stored in a cool place it’s most likely fine. Personally I would not use it. I on
only buy what I need.


Wow! took several responses before someone mentioned the most important thing....what was the temperature it was stored....that is the most important factor.


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Cummins12V98

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Posted: 07/08/20 10:52am Link  |  Quote  |  Print  |  Notify Moderator

Learjet wrote:

Cummins12V98 wrote:

If stored in a cool place it’s most likely fine. Personally I would not use it. I on
only buy what I need.


Wow! took several responses before someone mentioned the most important thing....what was the temperature it was stored....that is the most important factor.


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