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  #13  
Old 06-04-2014, 04:49 PM
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Re: Peak Blue DEF - Walmart

DEF contains urea, very different from acetic acid which is vinegar.

Heat causes chemical breakdown of urea into ammonia. This is part of the process of how it works for selective catalyst reduction (SCR) in this system. The heat from the exhaust turns the urea into ammonia (thermal decomposition) which is the functional chemical in the reduction process. Heat in your garage or DEF tank if your GC is out in the heat for that matter does the same thing just at a much slower rate than when it's injected into the hot exhaust.
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  #14  
Old 06-05-2014, 01:14 PM
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Re: Peak Blue DEF - Walmart

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Originally Posted by 1bluemcm View Post
The same code has always been on the outside of the carton of all Peak BlueDEF I've bought - 4 jugs so far. It's just stamped on one of the sides over the printed material somewhere, have to look closely for it but it's there. So we can check manufacture date prior to purchase.
For what ever reason mine was not stamped on the outside of the box.
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Old 08-13-2014, 06:28 AM
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Re: Peak Blue DEF - Walmart

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Originally Posted by 1bluemcm View Post
The same code has always been on the outside of the carton of all Peak BlueDEF I've bought - 4 jugs so far. It's just stamped on one of the sides over the printed material somewhere, have to look closely for it but it's there. So we can check manufacture date prior to purchase.

I'm not sure if this was ever corrected or not, but the bar code is not the date code. I went to several stores and found the exact same trailing digits in the bar code--032113--on every box I looked at. Every Peak bottle, regardless of store, was manufactured on exactly the same date? I don't think so. I'm going to buy a bottle at Wal Mart and check the code on the bottle. I'll bet it wasn't manufactured on March 21, 2013.


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Old 08-13-2014, 09:19 AM
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Re: Peak Blue DEF - Walmart

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Originally Posted by GCOverland View Post
The DEF might get too old before I would use the entire tank - so it might be safer to refill only small amounts like the 2.5 gal.
Don't refill with too small a volume, though. The DEF tank fill sensor is a weird ultrasonic thing.

When adding DEF it is important to add at least one gallon.
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Old 08-13-2014, 07:59 PM
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Re: Peak Blue DEF - Walmart

I look one of the PEEK DEF boxes on the shelf when I was in Walmart and I saw production date printed on the label.
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Old 08-13-2014, 09:33 PM
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Re: Peak Blue DEF - Walmart

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Originally Posted by isstay View Post
I look one of the PEEK DEF boxes on the shelf when I was in Walmart and I saw production date printed on the label.

I saw the same label at a local Wal Mart. It's not the manufacturing date but an inventory control date. I bought a bottle that had a label on the outside of the box of June 25, 2014. I bought the box and cracked it open. The manufacturing code stamped on the bottle -- 15209 -- translates to June 5, 2014. So, the exterior label is close enough but not the exact manufacturing date.


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Old 08-13-2014, 09:52 PM
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Re: Peak Blue DEF - Walmart

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Originally Posted by JEB1 View Post
I saw the same label at a local Wal Mart. It's not the manufacturing date but an inventory control date. I bought a bottle that had a label on the outside of the box of June 25, 2014. I bought the box and cracked it open. The manufacturing code stamped on the bottle -- 15209 -- translates to June 5, 2014. So, the exterior label is close enough but not the exact manufacturing date.


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I'll say that is close enough.
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Old 08-17-2014, 06:20 PM
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Re: Peak Blue DEF - Walmart

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Originally Posted by isstay View Post
I'll say that is close enough.
So I bought, and put in my car, a container of DEF Blue with this stamp on it:


WHAT DOES THIS DATE MEAN? The normal 2 digit code of "14" or "15" is not present instead to me it looks like a "64" and this doesn't conform to the 2 digit year+1 message that i've seen on other forums and this one!?!?!?

Anyway I added it and within a day or two I get the incorrect DEF message. Well I went to walmart tonight to add some fluid (I am about 65-70% full so I was going to fill it up) and I see THIS freaking sticker and no stamps on the box with the normal 11 digit code:


The date that is stamped on this box is from last Thursday (8/14/14), there is no way they made it and shipped it that fast but after seeing your message maybe its an extremely fresh batch the store JUST received!?!?
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  #21  
Old 08-19-2014, 09:37 PM
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Re: Peak Blue DEF - Walmart

I did see same label on one of the boxes, but now when I start looking at your picture it seems to me that this is Walmart store label. I did search around and found this info:

Peak UPC Code

also info on the code:

Blue DEF Date Code

If we assume that "1" is missing between 6 and 4 in your first picture it looks loke you have fluid made in 2013 in 309th day of the year, or around end of October, or in November - according to the article in second link. I am not quite sure what "6" stands for in this code unless is a part of manufacturing facility code otherwise it does not make sense - year 2063=64-1.
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Old 08-20-2014, 07:53 AM
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Re: Peak Blue DEF - Walmart

Moved my original post to the correct thread...
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Old 08-25-2014, 07:29 PM
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Re: Peak Blue DEF - Walmart

O'Reilly Auto Parts has BlueDEF on sale this week. The 2.5 gal box has the date code stamped on the box. See photo.
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  #24  
Old 08-25-2014, 08:47 PM
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Re: Peak Blue DEF - Walmart

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Originally Posted by mtnmerlin View Post
O'Reilly Auto Parts has BlueDEF on sale this week. The 2.5 gal box has the date code stamped on the box. See photo.
Pretty fresh DEF - manufactured July 22, 2014. Pilot travel centers also cary less than a month old BlueDEF.
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