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  #37  
Old 03-09-2015, 06:14 PM
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Originally Posted by Suns_PSD View Post
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?
Common mistake. There is no numeric readout on the DEF gauge. That "100%" is equivalent to the "F" mark on the fuel gauge.

Your DEF level must be inferred by looking at the relative length of the semicircular line.

I have no clue what their UI designer was thinking with that "100%" stunt. "F" and "E" markings just seemed too intuitive to use so they had to reinvent that, I guess.

Quote:
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.
If you're really trying to optimize then avoid topping off altogether. A full DEF tank is good for 8 to 10k miles. How long will it take to drive that? I keep mine between 15 and 50% full, adding a few gallons once I get low. However, I'm guessing that neither my optimization nor yours is necessary.

I don't want to give other owners complexes about things. Far too many EcoDiesel owners are concerned about DPF regens, clogging, DEF, etc... this machine really isn't a delicate flower (well, except for the stupid injector that needs Dom's skid plate).

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  #38  
Old 03-09-2015, 07:49 PM
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Originally Posted by Suns_PSD View Post
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.
Whoa, wait. You found a way to access engine lifetime hours on an EcoDiesel?!
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  #39  
Old 03-10-2015, 01:08 AM
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Re: DEF Tank Capacity

Quote:
Originally Posted by Roadkill View Post
Whoa, wait. You found a way to access engine lifetime hours on an EcoDiesel?!
I want to see this too! Maybe he was talking about diesel vehicles in general?
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  #40  
Old 03-10-2015, 10:04 AM
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Re: DEF Tank Capacity

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.

Roadkill - I did check out some of the other parameters. Of most interest is engine oil temperature, which I will watch next time I'm off roading. Last summer I did Imogene Pass in CO, on a relatively cool day. The engine temp dial on the main screen crept towards the upper 1/4 of range and warm air started blowing from cabin vents... and I was just creeping.

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).

Thanks for that link; my eyes glazed over after getting through 1/2 that thread. I wouldn't be concerned about adding DEF at vehicle temps down to near freezing point (which is 11F). Note I say vehicle temps - if you added DEF that is at 20F to a vehicle at 0F, you'll probably have the DEF freeze in the fill nozzle. Note this is different than the crystallization that is being referred to in the other thread, and observed on the DEF injector by a few. To cut to the chase, urea is soluble in 20C (68F) water at 1,080 grams/liter. The 32.5% urea in DEF is about 348 grams/liter, one third the solubility. In my opinion, if someone is having another problem with their DEF system (minor leak, poor flow) and is in a hot environment, they might evaporate enough water to cause crystallization.

One unrelated question, raised by the thread you forwarded: does anyone know of a source for the DEF injector skid plate, or "panel" as one poster referred to it? First thing I noticed when I crawled under my new Jeep was the horribly exposed lines - which I later learned were DEF-related - routed under the frame. Even better, anyone ever done a rerouting of these to a more off-road worthy location?
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  #41  
Old 03-10-2015, 10:07 AM
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Re: DEF Tank Capacity

Apologies for not putting Roadkill's quotes in "quote" in my message above - still need to learn how to do that...
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  #42  
Old 03-10-2015, 10:13 AM
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Re: DEF Tank Capacity

Quote:
Originally Posted by Gofastr View Post
Of most interest is engine oil temperature, which I will watch next time I'm off roading. Last summer I did Imogene Pass in CO, on a relatively cool day. The engine temp dial on the main screen crept towards the upper 1/4 of range and warm air started blowing from cabin vents... and I was just creeping.
I wouldn't worry about it. The experience that many others have had is that our gauge is "honest" unlike other manufacturers who have the gauges retard in a nonlinear fashion. Consequence: the gauge looks hot, but overheating doesn't happen in practice. There are threads about this on the forum.

You might consider getting an inexpensive bluetooth OBDII dongle from Amazon and a smartphone/tablet app to go with it if you like to monitor data. I have used the Torque app on my Android tablet to make a HUD that displays temp/speed/rpm/whatever I want data on my windshield as I drive. It's pretty fun, actually.

Quote:
One unrelated question, raised by the thread you forwarded: does anyone know of a source for the DEF injector skid plate, or "panel" as one posted referred to it?
Dom's plate is practically mandatory: DEF INJECTOR and Harness protection group buy
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  #43  
Old 03-10-2015, 01:20 PM
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Re: DEF Tank Capacity

FYI -

The DEF nozzles at the truck stops are sized to fit our DEF tank input .
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  #44  
Old 03-11-2015, 11:01 AM
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Re: DEF Tank Capacity

One of the first things I did was to add Dom's DEF protecter plate. Once you get the alignment figured out it's a relatively easy install.
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  #45  
Old 03-11-2015, 02:18 PM
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Re: DEF Tank Capacity

Quote:
Originally Posted by Roadkill View Post
Whoa, wait. You found a way to access engine lifetime hours on an EcoDiesel?!
I don't drive the Jeep much as it's for my wife. But there was a screen that had total number of hours and miles. Maybe it was resettable and just had not been reset yet?
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  #46  
Old 03-11-2015, 07:34 PM
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Re: DEF Tank Capacity

That could well be your trip screen !
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