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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VinnyP

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Posted: 07/07/20 12:48pm Link  |  Quote  |  Print  |  Notify Moderator

I have an opened jug of DEF dated July 2019. Can't tell if that is a manufactured date or an expiration date. Any ideas? Or should I just breakdown, dump it and buy a fresh jug?


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Turtle n Peeps

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Posted: 07/07/20 01:13pm Link  |  Quote  |  Print  |  Notify Moderator

There is no solid answer.

All sorts of conditions come into play like heat or cold or sealed or unsealed.

"I" would not worry about it if it was sealed. But that's me.


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Huntindog

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Posted: 07/07/20 01:42pm Link  |  Quote  |  Print  |  Notify Moderator

VinnyP wrote:

I have an opened jug of DEF dated July 2019. Can't tell if that is a manufactured date or an expiration date. Any ideas? Or should I just breakdown, dump it and buy a fresh jug?

IMO the risk reward ratio is not good
$10 worth of def vs a huge repair bill if it goes bad in the tank



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NRALIFR

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Posted: 07/07/20 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

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.

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Grit dog

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Posted: 07/07/20 01:52pm Link  |  Quote  |  Print  |  Notify Moderator

VinnyP wrote:

Any ideas? Or should I just breakdown, dump it and buy a fresh jug?


Pheww, quite the quandry here. You have an expensive truck that presumably is worth alot of money becasue it's fairly new, diesel, and likely doesn't get driven much.
Now you have a partial jug that you didn't manage to use in the last year or so and how long will that DEF sit in your truck?

Bottom line don't be a cheap ___ and save yourself potential/likely future headaches at the expense of spending 10 whole dollars on your truck.


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Grit dog

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Posted: 07/07/20 01:57pm Link  |  Quote  |  Print  |  Notify Moderator

NRALIFR wrote:

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.

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And for only the cost of 2 NEW jugs of DEF or probably 6+ gallons at the pump you could buy a device to "check" it....
How is this even a question or a thread?

(BTW NRA, you're correct, but you just got over the OP's head, mechanically speaking. He's best off parting with an Alex Hamilton and a couple of G Dubs for some fresh DEF...)

RobWNY

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Posted: 07/07/20 02:01pm Link  |  Quote  |  Print  |  Notify Moderator

From what I've read, DEF gets "iffy" after 18-24 months. Is that date of July 2019 from a Blue DEF code? If so, it was actually made in July of 2018.


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stickdog

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Posted: 07/07/20 02:03pm Link  |  Quote  |  Print  |  Notify Moderator

I would dump it. It would work good as fertilizer but would want to water it down as it's 33% urea which could burn whatever you dump it on.


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VinnyP

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Posted: 07/07/20 02:21pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like I’ll dump it and get a fresh jug. Thanks everyone!

Cummins12V98

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Posted: 07/07/20 02:46pm Link  |  Quote  |  Print  |  Notify Moderator

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


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