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Old 08-08-2016, 05:51 PM   #11
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That's ridiculous and fiction. Shelf life is over 12 months and I can assure you, Walmart, Target, Love's and all the major truck stops are not going to have DEF sit around unsold for over a year.

If they do, they need to fire their order processors and half their management.

In Los Angeles at 74 degrees, DEF fluid has been shown to last 44 months. The boxed "BluDEF" is more expensive, if you live near and drive interstates, lookup the closest truck stop. Quite a few if not most carry bulk def and have lanes set up just for DEF. Usually about $1.79-$1.99 a gallon, much cheaper than the $12 2.5 gallons you get at Wally World.

It will deteriorate but will NOT go BAD. It just loses some effectiveness, but then the vehicle will just use more of it. Even frozen in the tank, the vehicles coolant hoses are wrapped around the tank to thaw the DEF, and it will continue to work. EPA requirements are that it must thaw within 70 minutes and all vehicle manufacturers are well within that guideline and vehicles will operate normally until it is thawed.
I don't consider 12 months very long. Some people like myself will buy oil when it's on sale and it can sit for a long time. But, thanks for the info. I learned something. Gracias.

As an aside, Walmart sucks and if you think anyone there cares about shelf life, you're crazy.

I will buy my DEF from the pump at a busy truck stop.
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Old 08-08-2016, 05:56 PM   #12
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Originally Posted by BandJCarm View Post
Why is DEF fluid dated on the carton, then???

If it's out of date on the shelf don't buy it... Get the fresh stuff...

dano1955 is right... DEF doesn't go bad when it goes out of date. The truck will adjust the amount accordingly.
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Old 08-08-2016, 05:59 PM   #13
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Well, that's not what the GMC dealer told me, but I'm no expert.

I was told it was sorta like Milk, as an analogy. That you don't buy new milk with a new date, bring it home, and mix it with old milk. That said, mixing milk when neither is out of date shouldn't be an issue if you drink it in the next few days.

But I am no gearhead. I just put some in when it needs it, wherever I happen to be to get it.....
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Old 08-08-2016, 05:59 PM   #14
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Tractor Supply carries DEF, as well. FYI
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Old 08-08-2016, 06:18 PM   #15
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Remember DEF is corrosive. Any metal sensors in contact with the stuff will eventually fail.
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Old 08-09-2016, 08:22 AM   #16
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I think there something being overlooked about the shelf life issue. The time starts the moment it is manufactured. How long did it sit in the manufacturer's warehouse? How long did it sit in the Big box store's warehouse before it was shipped to the store? Best thing is to always check the date.

And yes most vehicles have the ability to adjust for different concentrations. That ability does have limits.

My concern with a diesel powered RV is how much it sits. It would be easy to see how the fluid would age past it's usable life in the tank of a RV that is not used much.
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Old 08-09-2016, 11:40 AM   #17
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I think there something being overlooked about the shelf life issue. The time starts the moment it is manufactured. How long did it sit in the manufacturer's warehouse? How long did it sit in the Big box store's warehouse before it was shipped to the store? Best thing is to always check the date.

And yes most vehicles have the ability to adjust for different concentrations. That ability does have limits.

My concern with a diesel powered RV is how much it sits. It would be easy to see how the fluid would age past it's usable life in the tank of a RV that is not used much.
And how long did it sit in an environment that is 100+ degrees?
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Old 08-09-2016, 11:45 AM   #18
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And how long did it sit in an environment that is 100+ degrees?
Yes, most warehouses are not climate controlled. Just ask anyone who has worked in them.
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Old 08-10-2016, 09:01 PM   #19
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I have had two Cummings go into protect mode both trucks were dodge 5500 delivery trucks. And both times I was busy and purchased at Walmart.


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