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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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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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