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Old 04-05-2011, 01:13 PM   #1
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Question Diesel Particulate Filter (DPF): When should we replace?

Hi,

I have 2008 GL320CDI with approx. 72K miles that I bought CERTIFIED ~1.5 years and 27K miles ago.

The car was sluggish occassionally and the stealership finally told me that my Diesel Particulate Filter (DPF) needs to be replaced. And the part cost...

$3900

And the worst thing is the warranty doesn't cover it.

So my questions:
1. Is it normal to have DPF failed at this mileage?
2. Is it true that MB extended warranty doesn't cover this?
3. Given the car was "recently" purchased as CERTIFIED, would I have a case to complain to MBUSA?

Any directions is greatly appreciated.

Thanks.
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Old 04-05-2011, 01:47 PM   #2
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Are you sure about the price ?
I Goggled " Diesel Particulate Filter " and it seems like this part should not cost more than $300-$400. Have you tried to call to another dealer or independent shop?
I just bought GL and waiting for my car to arrive on Saturday, but if it's true - I will sell it before my factory warranty expires in 4 years. It's ridiculous price.
Good Luck.

P.S. here is the interesting info about DPF
http://www.epa.gov/cleandiesel/documents/420f03017.pdf
I think I was wrong about the price, but it seems like this thing can be cleaned. Why change ?

Last edited by aeggroup; 04-05-2011 at 01:52 PM.
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Old 04-05-2011, 02:06 PM   #3
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Thanks... Yeah, if I need to shell $4K+ for this crap, I will certainly sell this POS. FYI, it is NOT covered under warranty - at least according to my SA - so having a warranty or not, doesn't really matter. If this fails and you want to have it repaired, you need to pay

I just sent an email to MBUSA to confirm that:
1. It is normal to have DPF failed at 72K miles (the doc you linked above suggests that it only requires cleaning at 100K miles)
2. It is not covered under warranty - if I need to pay out of pocket, it will really upset me as CPO means crap.
3. The price is really that high. I will certainly check with indy shop and see whether I could get it cheaper.
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Old 04-05-2011, 02:54 PM   #4
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That price is probably for the entire exhaust system as was the case with my wife's BMW. Muffler shop was able to weld in a new converter for $300.00. Try a good muffler shop.
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Old 04-05-2011, 06:01 PM   #5
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Is emission control parts not covered by a Fed mandate for 100,000 miles?
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Old 04-05-2011, 06:22 PM   #6
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NO warranty covers wear items. NO warranty covers filters.

If you'll check your warranty booklet, you'll find the DPF was fully covered until 2yrs/24K miles. This obviously for manufacturing defects.

The Cat converter--by Federal mandate--is warranted for 8 yrs/80K miles, but clearly the Feds don't mandate the same for the DPF. They are two different things, of course.

Oh, and guess again regarding finding an aftermarket DPF. aintgonnahappen.com

The Mercedes part number is 164 490 14 92 and MSRP is $3050.00 and you can get one (pre-freight) for $2287.50 from this dealer selling online
https://www.getmercedesparts.com/oem...des-parts.html

There are various lines that connect to this thing to fuel it, etc., and they could require replacement as well.

EPC contains footnote for this item reading "part is only or also supplied as reconditioned part" so may want to verify this with parts people. I don't find it in the online reman parts catalog, but that doesn't necessarily mean much.

Best bet may be to discuss with an independent Mercedes mechanic. By this, I mean a guy that has VERY RECENT dealership experience. Only. STAR Diagnosis equipment is required to reset CDI control unit when DPF is replaced.

Now, I've seen little on forums regarding anyone else requiring this be replaced. It is, of course, also possible through "user error" to ruin one. Must be ULSD fuel, no more than B5 biodiesel, and correct motor oil (always). Sticker under hood of mine says don't even add a quart of oil between changes that isn't the correct, i.e. low ash oil.
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Old 04-05-2011, 06:56 PM   #7
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Very unusual for a DPF to require replacement. Usually they can only be messed up from dirty fuel that contaminates the catalyst - typically sulfur. Adds a whole new new meaning to the 'buy clean fuel -KEEP IT CLEAN' mantra!
If the dealer certified it, then you MIGHT be able to argue that most of the contamination existed when you bought, but you better be able to PROVE that ALL the fuel you bought came from impeccable sources, was ALWAYS ULSD, etc, etc.
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Old 04-05-2011, 08:20 PM   #8
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I would think if your DPF failed you should have a check engine light?
Never heard of one failing, and these things are used worldwide in taxis etc. I am sure if they were prone to failure at 70K miles, there would be a lot of postings on forums or the media etc., especially at $4000 a pop. I have over 87000 miles on mine.
From all my research, all I can say that will cause premature failure is Low Sulfur Diesel. No one sell that anymore, as everything is mandated to be ULSD. If the DPF is the cause of your sluggishness, make sure you didn't get a bad tank of fuel from somewhere.
I would say try a different dealer to see what is causing your issues. Bad turbo or vane controller maybe?
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Old 04-05-2011, 11:17 PM   #9
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Sounds like previous owner was using home made diesel fuel.
This part should really last long.
Maybe you took some bad fuel somewhere.
Low ash oil is very important as well.
Do you have Shell POWER DIESEL there?
Fuel quality does really matter.
How does the stealership knows it is this whole part and not just one component from it?
Please explain slugish occasionally.
No error lights on the dashboard?
Try to empty the tank as much you can fill up with good fuel and take it on the highway for nice long spin to clean it up.
Check fuel filter as well.
After an service in the stealership my car would smoke on the highway in long trip it was cleaning dfp filter apparently. Truckers were calling me on my radio. It would smoke for couple km's and after that nothing.
Maybe your system didn't clean itself or service was not done at the dealership before.

Many issues could cause this problem.
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Old 04-05-2011, 11:26 PM   #10
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Why not just get a tuning company to turn off the DPF functions, then remove it till you sell the vehicle?

It would be a lot cheaper and the motor will be happier. Now, I don't know what sort of emissions testing you have up there, so this may not work for you unless you just gut the filter guts and reinstall it, to make it look like it's still on, should they do a visual inspection.
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Old 04-06-2011, 10:08 AM   #11
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DPF cleaning

As a recent purchaser of the R320 with the same DPF in the motor, your post is really scary. Have you checked into getting the DPF cleaned? There are a number of vendors who offer this service, such as: http://www.fsxinc.com/site1/Services/FltCleanPgm.html

good luck & keep us posted.
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Old 04-06-2011, 11:05 AM   #12
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Dpf fliters will load up more often if you do a lot of idling or stop and go traffic, try driving it on the highway(60 mph +-) for at least a half hour, that should generate enough heat to burn off the soot and clear itself.
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Old 04-07-2011, 06:18 AM   #13
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I understood that when the differential pressure across the DFP increased to a certain point the engine went into DFP cleaning mode & gave a richer mixture to burn off the carbon & clean the unit.

Can you check check if this mode is happening ?.

$3900 sounds crazy.

I am glad I don't have one & will put up with washing the soot of the rear of the car every 3000 km.
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Old 04-07-2011, 10:49 AM   #14
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Dpf fliters will load up more often if you do a lot of idling or stop and go traffic, try driving it on the highway(60 mph +-) for at least a half hour, that should generate enough heat to burn off the soot and clear itself.
Agreed. Also, try to keep the RPMs up too. If the "clean mode" was not being triggered, this would certainly generate a code.
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Old 04-07-2011, 12:22 PM   #15
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I really am surprised no one's yanked their DPF out from under their vehicle.

I don't know about the GL's, but on other manufacturers' diesels, the vehicle sees an instant 2 to 3 mpg fuel economy increase.

Only down side is finding a tuning company that can turn the DPF functions off in the ECU.

And in case this gets read by a leaf licker, please, don't even start with the whole Global Warming/climate change bs.

Now, of course, this modification should only be done for an off road vehicle only.
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Old 04-07-2011, 06:40 PM   #16
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I really am surprised no one's yanked their DPF out from under their vehicle.
Well, besides being illegal your car won't run if you do ... just as it won't run if you run out of AdBlue.
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Old 04-07-2011, 09:24 PM   #17
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Besides being illegal, the engine (and car) will run just fine once the DPF functions have been turned off with a tune.
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Old 04-08-2011, 10:46 AM   #18
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Well, besides being illegal your car won't run if you do ... just as it won't run if you run out of AdBlue.
Why it should be illegal ? I am not sure that every diesel car has DPF. It's more as feature. Here in Canada, when you go for emission test (diesel only), the car is inspected ONLY visual.

If you find somebody in Canada who can relief me 4k $ service, I'm willing to risk that my computer is not going like it

It's all about if it can be disabled through STAR but I don't think it's illegal (illegal is everything related to safety to car, isn't it ?)

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Old 04-08-2011, 11:56 AM   #19
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In the US, it's illegal because of the Clean Air Act our leaf lickers friends who work for the EPA came up with.

I believe that every diesel engine placed into a road worthy automobile is required to have a DPF installed, as of 2007 or 2008. Sure, lots of older diesels don't have DPF's but none that didn't come with one after 07 or 08.

Problem is that without turning off the DPF functions in the computer, you will get CELs and the vehicle will run like crud. Not to mention the extra fuel that you would still be burning.


Section 203 (a)(3)(b) of the Clean Air Act
(CAA), 42 U.S.C. Sec. 7522(a)(3)(b), prohib*
its the manufacture, selling, or installation of
any device that bypasses, defeats, or renders
inoperative a required element of the vehicle’s
emissions control system.
Section 203 (a)(1) of the same Act also pro*
hibits the sale of motor vehicles or engines that
are not covered by valid certificates of con*
formity.
40 CFR Part 86, Subpart A describes the
regulatory requirements for defeat devices
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Old 04-08-2011, 01:47 PM   #20
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Besides being illegal, the engine (and car) will run just fine once the DPF functions have been turned off with a tune.
Doing that (I suspect mostly) mythological "tune" is illegal, too.
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Old 04-11-2011, 05:54 PM   #21
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Take it on the highway road trip it will clean it up and trigger the cleaning process.
I was that it needs some time to do. It won't trigger in short city driving.
It should trigger after service done or close to service interval.
Happen to me all the time.
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Old 04-11-2011, 06:45 PM   #22
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Take it on the highway road trip it will clean it up and trigger the cleaning process.
I was that it needs some time to do. It won't trigger in short city driving.
It should trigger after service done or close to service interval.
Happen to me all the time.
How can you tell it's triggered? I commute 20 miles each way every weekday, at an average speed of around 60-70. I'd say 75% of my miles are put on that way, so I'm guessing mine is very unlikely to get clogged anytime soon?
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Old 04-11-2011, 07:51 PM   #23
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Originally Posted by B200Turbo View Post
Take it on the highway road trip it will clean it up and trigger the cleaning process.
I was that it needs some time to do. It won't trigger in short city driving.
It should trigger after service done or close to service interval.
Happen to me all the time.
Wow, Why I didnt think of that?
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Old 04-11-2011, 07:53 PM   #24
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How can you tell it's triggered? I commute 20 miles each way every weekday, at an average speed of around 60-70. I'd say 75% of my miles are put on that way, so I'm guessing mine is very unlikely to get clogged anytime soon?
It will not tell you if it's doing it's job, it will only tell you if it can't.
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Old 04-12-2011, 08:54 AM   #25
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Take it on the highway road trip it will clean it up and trigger the cleaning process.
I was that it needs some time to do. It won't trigger in short city driving.
It should trigger after service done or close to service interval.
Happen to me all the time.
This is not exactly the case. Most Taxis are strictly in-town rides, and, as someone posted above, if the DPF was prone to failure, there would likely be thousands of cases posted. The cleaning is triggered by pressure differences that occur as the filter starts to clog. When the pressure differential triggers the cleaning cycle, the engine switches to a "richer" fuel mixture which literally burns the particulates out of the filter. The filter should be maintenance free. I would recommend to the OP to get a second opinion. A mass air sensor will also cause the symptoms described and these are fairly simple and inexpensive to replace.
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Old 04-12-2011, 08:54 AM
 
 
 
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2008, bad, benz, cdi, cover, diesel, dpf, filter, mercedes, particulate, r320, r320cdi, system, turndown, warranty



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