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  #133  
Old 04-21-2012, 04:09 PM
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Re: Diesel Grand Cherokee Coming to US!

The Diesel in the USA will have to have the Urea injection. No other car maker has been able to meet EPA standards in big vehicles without this system. If VW can't get their 3500 lb Passat with a 2.0L TDI to meet it without Urea, there is no way Jeep will with a 5000 lb V6.
The EPA standard is way more strict about NoX emissions than Euro 5 is; that is why all the larger diesel vehicles in the USA need Urea Injection while they are sold overseas without. This likely has something to do with why we are seeing the diesels two years later here than overseas.
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  #134  
Old 04-21-2012, 06:33 PM
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Re: Diesel Grand Cherokee Coming to US!

The U.S. JGC diesel will have SCR. The 2012 Jetta is the only clean diesel in the US that doesn't have it. The 2012 Passat has it and is about 230 lbs heavier, yet is epa rated about 1 mpg higher.

SCR is no big deal, the fluid has an ISO spec. (22241) the fluid is common to all manufacturers and is readily available at all parts stores, truck stops and places like walmart. The annual cost (15k per year) on a 3.0L CRD is about $35, 7 gallons at about $5 a gallon, this has been my personal experience in over 30k miles.

Filling the tank is about as complicated as adding washer fluid.
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  #135  
Old 04-23-2012, 09:30 PM
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Re: Diesel Grand Cherokee Coming to US!

You don't have to add urea but every few thousand miles as well.. I doubt anyone or many people who can afford a diesel would not have a heated garage, but I still say this:

if the urea tank is below 12F and freezes, when you start it up it will start to thaw the tank and lines and start a timer on you because you are driving without urea injection. If you drive too short of a distance and park it will not thaw it and will refreeze, repeat this enough and the car won't let you start it or drive.

I just find that so obsurd that I cannot get past it to calculate how many 10s of thousands of miles I'd need to drive to break even on the extra cost of diesel cars.

OK, I'll stop ranting now.
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Old 04-24-2012, 11:44 AM
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Re: Diesel Grand Cherokee Coming to US!

Quote:
Originally Posted by comnjeep View Post
You don't have to add urea but every few thousand miles as well.. I doubt anyone or many people who can afford a diesel would not have a heated garage, but I still say this:

if the urea tank is below 12F and freezes, when you start it up it will start to thaw the tank and lines and start a timer on you because you are driving without urea injection. If you drive too short of a distance and park it will not thaw it and will refreeze, repeat this enough and the car won't let you start it or drive.

I just find that so obsurd that I cannot get past it to calculate how many 10s of thousands of miles I'd need to drive to break even on the extra cost of diesel cars.

OK, I'll stop ranting now.
Where is this coming from? I've never seen any new diesel vehicle do this. They should even start with an empty tank. Depending on the size of the tank you shouldn't be adding DEF every few thousand miles either. From my experience I can get DEF anywhere I can get oil, windshield washer fluid, etc. The Jeep may not even need DEF, if it does it's not a big deal.

http://www.urea-scr.com/faq.html#3

Quote:
Why is it important that Diesel Exhaust Fluid be periodically replenished and how often does it have to be replenished?

Itís necessary to replenish Diesel Exhaust Fluid periodically since itís a consumable fluid used in proportion to the fuel (typically 1-2 % by volume). Itís expected that replenishment will be synchronized with normal maintenance service intervals, roughly every 6-12 months (e.g. oil changes).
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Old 04-24-2012, 07:01 PM
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Re: Diesel Grand Cherokee Coming to US!

I agree, freezing is not an issue. You are also correct that def doesn't need to be added every few thousand miles, more like every 10k miles. As mentioned above it is about as difficult as adding washer fluid. This is based on personal experience having owned a BMW 335d and a Touareg TDI.

SCR is not an issue to be concerned about.
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  #138  
Old 04-25-2012, 09:16 PM
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Re: Diesel Grand Cherokee Coming to US!

Did I miss the specs and engine/ trans that will be used? Any release dates yet? I'm hoping not too long as I'm tyring to hold out and order the Diesel WK vs Hemi Overland. If it's 8 months out yet, I won't be able to wait.
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  #139  
Old 04-25-2012, 10:52 PM
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Re: Diesel Grand Cherokee Coming to US!

Urea freezing comes from an X5d forum where the owner was aware of the lock-out on the ignition if the car ran without urea too long (something like 30 minutes)... Several cold starts and short drives could do this unless there is some battery use after stopping I suppose..
I agree this is not going to happen to many folks, but living where it can be below 12F for, oh, say 3 weeks straight might make you consider it.

Do you know what happens in your diesels if you simply run out of urea and don't replace it?
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Old 04-26-2012, 01:46 PM
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Re: Diesel Grand Cherokee Coming to US!

Quote:
Originally Posted by comnjeep View Post
Urea freezing comes from an X5d forum where the owner was aware of the lock-out on the ignition if the car ran without urea too long (something like 30 minutes)... Several cold starts and short drives could do this unless there is some battery use after stopping I suppose..
I agree this is not going to happen to many folks, but living where it can be below 12F for, oh, say 3 weeks straight might make you consider it.

Do you know what happens in your diesels if you simply run out of urea and don't replace it?
The car will not start if you neglect to refill the urea...this has nothing to do with the engine requiring, instead it is a requirement mandated by the EPA. Other cars with these systems start warning you when you have a few hundred miles of range left, so you have plenty of opportunity to refill. It would probably be a good idea to keep a liter of the fluid in the car just incase. I was just at Wal Mart and 2.5 gallons of this fluid was 8 dollars. The ML320 goes 15000 miles on 7.5 gallons, so the total cost of this fluid is reasonable if the refill is done DIY. Dealers will probably rape you on this service if you give them the impression that you do not know that this stuff is available elsewhere.
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