Purchasing a W211 Bluetec high miles! Advice? - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 06-23-2019, 10:08 AM Thread Starter
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Purchasing a W211 Bluetec high miles! Advice?

Hey guys!
I have been reading a lot on CDI vs Bluetec! there are many great examples of CDI's over 300k miles, and their reliability is rock solid! but there aren't many posts on bluetec's !
I am looking to purchase 07 with 200k miles immaculate inside and out! one owner! owner claims those are all highway miles but who knows, what are you your suggestions? is this car DIY friendly? what are major things to look out for? Is engine and Trans solid? Are there any examples of bluetec's gone over 250-300k because there is no mention or talks of that!! Or should I walk away from this one? From what I have gathered people are complaining about the add blue fluid also few minor things that I am not very concerned about trade-of for the face lift is worthy! if it adds a little more to maintenance for minor things I am okay with it! I love the smoothness of the V6! what things should I look out for? I appropriate you guys taking your time to read and response to this!
Thnaks
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post #2 of 15 (permalink) Old 06-23-2019, 10:29 AM
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CDI=good.
Bluetec=bad.
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post #3 of 15 (permalink) Old 06-23-2019, 10:36 AM
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CDI=good.
Bluetec=bad.
Why? In what ways? Thanks
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post #4 of 15 (permalink) Old 06-23-2019, 11:19 AM
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I wouldn't go that far. CDI definitely = good, though, and that's why I bought one. Rossafuss's 2005 CDI has in excess of 450,000 miles on it, and only very recently did he end up having to rebuild the transmission. He had a look at the engine, and it remains in remarkably good shape.

The 2007 Bluetec CDI's aren't too bad. However, you will need to deal with the existence of Diesel Particulate Filters (DPF's), and I understand those are pretty expensive to replace. You won't have to deal with urea injection systems on a 2007; I think the urea injection came in 2010.

Despite any recommendations to the contrary, even by the factory, I change my engine oil every 5,000 miles. Make sure you do this as well, to keep your engine the happiest.

The other thing I'd be really concerned about is that 7-speed transmission. They're not nearly as DIY-friendly as the 5-speeds in the 2005 and 2006 cars are, and per MAVA and others, they're not as strongly built as the 5-speeds are. Make really good and sure that there are records on file for when the transmission fluid has been changed.

So, personally, I'd hold out for a 2005 or 2006. But that doesn't mean that the 2007-2009 Bluetec cars are necessarily "bad".

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post #5 of 15 (permalink) Old 06-23-2019, 11:22 AM
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Just buy an M112 or M113 gasser. The repair costs on the bluetec will far outweigh any fuel economy advantage.
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post #6 of 15 (permalink) Old 06-23-2019, 11:47 AM
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Well, some people specifically would like a Diesel car, e. g. Rossafuss and myself. I've got nothing against the M113 family of engines--we have three S-classes with the M113's--and it's nice to also have the Diesel.

But yes, tjts1 makes a good point. The M112/M113 engines are actually pretty darn low-maintenance.

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post #7 of 15 (permalink) Old 06-23-2019, 02:22 PM
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Hopefully not to sound too ignorant, I havenít heard much about DPFís and how they apply to my vehicle. Iíve owned my 2007 for a couple years and itís been good to me. Regular oil changes, transmission flushed and fluid changed, battery changed. Been a great car so far!
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post #8 of 15 (permalink) Old 06-24-2019, 05:55 AM
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Just to clarify a couple things: the 07 "Bluetec's" doen't have the AdBlu (Urea) injection, that's only 2009+ models.

As for whether the om642 is a "bad" engine is entirely dependent on how you plan on having it serviced. are you going to do the work yourself? have an indy do it? or dealership? maintenance costs add up very quickly on these engines because they are quite complected compared to their gasoline counterparts. some people just cant live without the torque, however.

The om642 V6 is also a reliable engine, but it has a couple things i consider "barriers to entry" in reliability that need to be checked/fixed before i would consider the engine reliable.

-The oil cooler seals need to be done. You either need to have PHYSICAL PROOF (IE: bill) that the seals have been replaced in the past, or have them done. i own 2 om642 bluetec's, and worked on 2 others for friends; every single one of them had leaking oil cooler seals.

-Swirl flap system needs to be eliminated, either physically or electronically. there is a well documented trick to "delete" the swirl flaps using a single resistor in the swirl flap motor electrical connector that eliminates all check engine lights.

i would not consider a om642 vehicle in my opinion unless you don't mind spending what you paid for the vehicle in maintenance over a 5 year period at a independent Benz specialty shop or dealership, or unless you don't mind doing a majority of the repair/maintenance yourself. Contrary to popular belief, these cars are NOT terribly hard to work on, but there are jobs that are a lot more frustrating than others (Oil cooler seals).

The om642 is a great engine in my opinion, as long as they're actually maintained properly.

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post #9 of 15 (permalink) Old 06-24-2019, 10:44 PM
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I am with Ross on general opinion.
When I loved OM642 performance, I did work on the engine and due to size and all the attachment it is service nightmare.
Just reinstalling driver side air box is job for 2 guys on lifted car, or me doing alone had to spend about 2 hr to fit box legs into the grommets I could not see.
If you like to get your hands dirty- you can buy those cars very cheap and there are no expensive parts that the engine will need. Oil cooler seals are like 5 bucks, cleaning the flaps is only labor, unless you go for replacing the gaskets.
Turbo rebuild kit cost about 40 bucks.
Maybe at 400,000 miles you will need to replace timing chain, but again it is labor cost with cheap parts that owners don't like.
Than at least those models don't have SBC and airmatics, so you don't get major headaches.


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post #10 of 15 (permalink) Old 06-25-2019, 12:49 AM
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Quote:
Originally Posted by Rossafuss View Post

As for whether the om642 is a "bad" engine is entirely dependent on how you plan on having it serviced. are you going to do the work yourself? have an indy do it? or dealership? maintenance costs add up very quickly on these engines because they are quite complected compared to their gasoline counterparts. some people just cant live without the torque, however. <img src="https://www.benzworld.org/forums/images/smilies/wink.gif" border="0" alt="" title="Wink" class="inlineimg" />
Then buy a V8 or an AMG. Problem solved, you're welcome.
Quote:
Originally Posted by Kajtek1 View Post
When I loved OM642 performance, I did work on the engine and due to size and all the attachment it is service nightmare.
Just reinstalling driver side air box is job for 2 guys on lifted car, or me doing alone had to spend about 2 hr to fit box legs into the grommets I could not see.
Life is too short for this shit.

There's only one diesel engine I'd tolerate in the 211 and it's not an om642 or om648.

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Last edited by tjts1; 06-25-2019 at 12:58 AM.
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