DEF Usage

Capricorn

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Is all DEF the same? Or do we need to go to dealer to get what our Jeep needs?
This is my first diesel......
According to the manual, any DEF that is API certified to ISO 22241 standard.
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HappyJeeper

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Cool. I know it has a shelf life. I don't put a lot of miles on mine, so I need to keep an eye out for that.
 

A.DiVe1

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Compression-Ignition

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Compression-Ignition

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Interesting. I just buy the name brand stuff (PEAK). Next time I go to buy some I'll look at the off brand stuff and see if it has an API cert label on it.

Seems odd that as nuts as they are with all this emmisions garbage, they would allow sub-grade DEF to be sold.

I still wonder if I'll be able to find any non-API DEF in my area, but I guess I stand corrected.
 

WXman

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I have never seen DEF that wasn't labeled as certified. I'd be willing to bet that the $7 Walmart brand comes off the same line as the $13 PEAK brand. Y'all are overthinking this. It's a urea/water mix. Not a lot to go wrong there.
 

Oldbear

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Also note that short runs = more regens= more DEF useage. Also suggest that you just fill up with DEF at the pump at any decent sized truck stop. Much cheaper and you will know it’s actually full. in my Ram the tank is like 8 gallons, and that’ll go pretty much 10k or more.
 

Oilburner

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I have never seen DEF that wasn't labeled as certified. I'd be willing to bet that the $7 Walmart brand comes off the same line as the $13 PEAK brand. Y'all are overthinking this. It's a urea/water mix. Not a lot to go wrong there.
(Painful as it is) I have to agree with WXdude here- :giggle:

Also: my 2020 JL diesel seems like it is using less DEF than when we first got it, perhaps part of the system learning your driving habits? I think it still uses more than advertised now, but I am usually pulling a trailer.
 

WXman

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I believe that idling increases usage, and cold weather does as well. That may be why most of us saw decreasing DEF usage as we got into summer. When I got mine it was February and the DEF needle dropped fast. Now, not so much.
 

Parratt

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Went through half a tank of a def in about 2500Km i Think thats a bit wild eh.
 

Capricorn

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Went through half a tank of a def in about 2500Km i Think thats a bit wild eh.
About normal.
Real life normal that is.
 
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AZ-Chris

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I've got 5,700 miles on my Rubicon and I've already added 5 gallons of DEF since taking delivery and my tank was topped off when I took delivery.
 

SaltyWet

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I checked the gauge when I was at the dealer taking delivery. It wasn't full, so I had them top it up. Went 7000km showing half full.
 

Capricorn

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I checked the gauge when I was at the dealer taking delivery. It wasn't full, so I had them top it up. Went 7000km showing half full.
That's about 4300 miles. That's pretty good. Mine was showing full on the gauge but went down to 35% after 3500 miles. And 90% of my miles were highway miles and each trip averaging 15-20 miles commute to work.
 
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