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  #25  
Old 05-12-2014, 08:32 PM
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  #26  
Old 05-13-2014, 09:46 AM
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Re: DEF Tank Capacity

When we took delivery in Jan our Jeep came off the showroom floor, the
dealer took it to the truckstop and filled it then took it to the shop and
my salesman filled our Def tank before we left, our Jeep had 49 miles on
the ODO and it did a Regen that night as we took off for a ride.
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  #27  
Old 10-06-2014, 11:26 AM
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Re: DEF Tank Capacity

I have seen in this thread pretty good proof the DEF tank is 8 gallons. However, several magazine publications on the internet are stating the tank is 8.5 gallons.

Could the difference be that the gauge measures full at 8 gallons and the 1/2 gallon discrepancy is for freeze expansion?
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  #28  
Old 10-06-2014, 06:04 PM
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Re: DEF Tank Capacity

Quote:
Originally Posted by ThumperButtercup View Post
When we took delivery in Jan our Jeep came off the showroom floor, the
dealer took it to the truckstop and filled it then took it to the shop and
my salesman filled our Def tank before we left, our Jeep had 49 miles on the ODO and it did a Regen that night as we took off for a ride.
How do you know it did a regen? Normal regens occur without indication. If you are saying it showed a message and was 80% full and required a drive, then it must have done some serious idle time before delivery, or you drove it a lot after delivery. Hopefully you don't see a message on the dash often. I never have in 24k miles of operation.
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  #29  
Old 10-06-2014, 11:57 PM
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Re: DEF Tank Capacity

We got the message to drive it at (Exhaust Filter XX% Full Safely Drive at Highway Speeds To Remedy),
we had only driven three blocks from the dealer after getting her and I heard a ding (message indicator) and only
caught the end of the message.

So I did not catch the message, ours was on the showroom floor and at the truck stop it had 41 miles on it.
So it had about 35 miles on it, I had the shop guy clear the trip so I did not see the hours on it.

We took off on a 100 mile ride and during the ride we got the (Exhaust System Regeneration Completed) message.

We've got 14,000 miles on ours and I don't think I've ever caught that message again but we don't do much in town driving.
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  #30  
Old 03-08-2015, 11:04 AM
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Re: DEF Tank Capacity

Took delivery on factory-ordered GC Ltd late March 2014 with 10 miles on it. Asked about DEF and dealer said that due to the short shelf life, they don't top DEF tank up at delivery unless asked to by customer. I didn't think I'd be driving a lot, so didn't ask. Got "will not start in 500 miles" DEF warning at 5,015 - at the start of a long road trip in Jan 2015. Paid $27 for a 2.5g fill at a dealer. Completed road trip; now at 8,900 and low DEF warning has yet to reappear.

I figure I'll normally be driving this awesome Jeep about 6,000 miles a year. Given the shelf life of DEF (urea - I'm a chemist and I think the shelf life @ temp estimates provided by Jeep are overstated), I was planning to add only 1g (Peak sells in these smaller jugs) at a time. But reading FnkyChkn case post above about no resets with <~1g fills, has me rethinking that approach.

Does anyone have experience with 1g refills, and/or failure to get a warning message about low DEF? I presume the "no DEF - no start" sequence is triggered by a low DEF tank reading, so if sensor is reading incorrectly (i.e. too high) one could run the DEF tank to empty and still get the motor to start?

Glad I found this site!
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  #31  
Old 03-08-2015, 12:46 PM
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Re: DEF Tank Capacity

Quote:
Originally Posted by Gofastr View Post
Got "will not start in 500 miles" DEF warning at 5,015 - at the start of a long road trip in Jan 2015. Paid $27 for a 2.5g fill at a dealer. Completed road trip; now at 8,900 and low DEF warning has yet to reappear.
What's your DEF gauge read? The system uses a crappy ultrasonic sensor, so it doesn't report a precise value (and is also the reason for the >= 1 gal fill up requirements). The gauge is in EVIC.

Quote:
Given the shelf life of DEF (urea - I'm a chemist and I think the shelf life @ temp estimates provided by Jeep are overstated), I was planning to add only 1g (Peak sells in these smaller jugs) at a time.
I suggest just buying freshly-squeezed DEF from the pump at a truck stop. You can add 1.5 gallons, or whatever your heart desires. I used Yara Air1 last time I needed DEF (bought 2 gallons, because I try to keep my tank between 25% and 50% full to reduce the average age of DEF in my tank): Air1 DEF Distribution Stations

I liked the fact that they care enough to claim:

Quote:
Yara is a reputable supplier of Diesel Exhaust Fluid

Air1 is Yara’s brand of Diesel Exhaust Fluid, as a reliable supplier of quality Diesel Exhaust Fluid, Yara has procedures in place to ensure the ISO specification is always met.

Air1 is licensed by the API
Air1 is audited throughout the whole of its production, supply and distribution chain
Air1 is in control of its own production methods and processes
Air1 is a prime produced (hot melt urea) Diesel Exhaust Fluid supplier
Air1 uses prime produced raw materials
Air1 can provide evidence of its processes on request
As a chemist, perhaps you can comment about the concern I have about buying PeakBlue that may have been stored in very hot or cold warehouses prior to reaching retail locations. There wouldn't be an easy way to tell if one were buying "abused DEF".

At least buying from a truck stop, one presumes that the underground tanks are a fairly uniform temperature and there is reasonably high turnover (thus, fresher DEF).
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  #32  
Old 03-08-2015, 02:38 PM
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Re: DEF Tank Capacity

8 Gallons sounds right !

We have almost 14k on our JGC and I've filled it up with DEF twice now. It came from the dealer with 1/4 tank of DEF in it.

Both times we filled up at Truck stops (Pilot Van Horn, TX and Love's Comfort TX). Once to fill up in July of last year coming back on I-10 from Palm Springs and this past week to fill up again before we head out on the road in our travel trailer. The EVIC was showing about 1/4 tank of DEF this last time and I put 5.733 gallons in it until it "burped" out the tank onto my feet!

Never had an issue with any warnings about Regen's since new. But, then again, we mainly do longer trips and also tow a Travel Trailer.

So far, so very good
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  #33  
Old 03-09-2015, 10:56 AM
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Re: DEF Tank Capacity

Thanks Roadkill - I didn't know that I could get a DEF tank reading on EVIC! It's showing 1/8 to 1/4 full - about right on track with the consumption rate Dodge has published of 1.6 - 2.0% of fuel consumption rate.

I would go with a DEF fill station, if I get near one here in CO. Air1 looks to only have 4 or 5 in the state; their site certainly conveys a sense of product and supply chain quality.

My stability concerns are based on use of urea in pharmaceutical testing labs; for that purpose notable degradation of urea is evident fairly quickly at temps above 30C (86F). I wouldn't worry about cold storage. The use as DEF is probably not as sensitive to such degradation. Published literature is pretty consistent, stating urea shelf life of 2 years at constant 30C. Note that published shelf life of DEF drops precipitously as temp goes up (down to 4 months at 104F). Whether buying Peak DEF in jugs or from bulk DEF fill station, the biggest temp variable is probably transportation (e.g. semis baking in the southern sun) - and presumably suppliers/retailers wouldn't want their product sitting for long in this expensive part of supply chain.

I just looked at 1g jugs of DEF at two local auto part stores. One was coded with a Dec 2015 date, the other Dec 2016; presumably "expiration" dates. Assuming I'm not traveling by a bulk station soon, guess which jug I'd buy??
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  #34  
Old 03-09-2015, 11:24 AM
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Re: DEF Tank Capacity

Quote:
Originally Posted by Gofastr View Post
Thanks Roadkill - I didn't know that I could get a DEF tank reading on EVIC! It's showing 1/8 to 1/4 full - about right on track with the consumption rate Dodge has published of 1.6 - 2.0% of fuel consumption rate.
Great! I hope you took the time to explore the other interesting data in there, such as tire pressures for each of the tires, etc.

Quote:
I would go with a DEF fill station, if I get near one here in CO. Air1 looks to only have 4 or 5 in the state; their site certainly conveys a sense of product and supply chain quality.
I think most truck stops have "DEF on tap"; that link was just for that specific Air1 brand. YMMV, of course.

Quote:
My stability concerns are based on use of urea in pharmaceutical testing labs; for that purpose notable degradation of urea is evident fairly quickly at temps above 30C (86F). I wouldn't worry about cold storage. The use as DEF is probably not as sensitive to such degradation.
It makes sense that the cold would retard degradation.

I'm no chemist, but would it be risky to add DEF while it is very cold? I ask because other owners have had their DEF nozzles clogged by crystalline precipitate that apparently seeded from some contamination or another. Based on quick googling, it appears that urea is highly soluble in water, and DEF is 32.5% urea (presumably by mass)... so, maybe this isn't a concern (by my read, DEF is nowhere near supersaturation).

I will note that our DEF tanks have a heater to try to keep the DEF temp from dropping out of spec.
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  #35  
Old 03-09-2015, 02:12 PM
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Re: DEF Tank Capacity

The water portion of DEF can evaporate in hot climates and this changes the ratio rendering it noncompliant and then throwing an engine code. Also hot temps can cause Algae to grow. This is only a concern if the vehicle sits a lot. I'm talking months here not days.

Generally you want the tank to be near empty before topping off as it ensures you don't have much old DEF in there keeping it more fresh.

Also, store bought sealed DEF is a better bet than bulk distributors in my experience. I work in trucking and the problems I have seen with DEF have all been related to bulk storage. The smaller comtainers have never caused a problem.

3 other random points and I'll stop!

My wife has done about 1800 miles on our GC and the DEF gauge still reads 100%. Does it go down in large chunks of 25% or something? Either way I'm not complaining! Maybe because she drives it carefully it's not using much?

Lastly, over the weekend the Jeep was definitely doing a passive regen of some sort. It was idling marginally higher and definitely had a more 'loaded' sound to it. It sounded like I was holding the brake and holding the go pedal simultaneously with the vehicle in gear. As I drove down the road at around 45 mph the instant mpg seemed notably lower than what is typical for those conditions. It was clear to both my wife and I that the vehicle sounded different. Ten minutes later when we arrived at our destination it was normal again.

I think new vehicles often go into regen because they get lots of idle time around the new car lot and such. This is easy to check by going to the screen that shows total hours ran and dividing it by the total number of miles. It is has an absurdely low mph well then you know.
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  #36  
Old 03-09-2015, 06:13 PM
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Re: DEF Tank Capacity

Do the truck stop fill spouts have the safety nozzle that requires something to open the end of the spout to fill the Jeep with DEF? Anyone have trouble filling at the pumps?
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