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  #16  
Old 07-12-2018, 11:53 AM
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I have had two '05 CDI's (still in the immediate family though), and have an '07 Bluetec now (I got such a good deal on the Bluetec, I could not pass it up). As far as the engine goes, the OM648 is probably the last "best" Diesel engine made in my opinion. The inline six is a powerhouse, and still delivers great economy. It is fairly easy to work on as well. I had to replace the SBC in one of the CDI's, but as previously stated, it was not a big deal. Doing the job myself (mostly) only cost around $600. I would have no problem keeping and driving a CDI for many hundreds of thousand's of miles. Agreed about getting an MB specific scan tool. Even if you don't do your own work, it is good to know what is going on before having something repaired. It is easy to get ripped off. As far as the '07 and newer, they have their problems as well, but they are well known. Being a DIY guy, I was able to replace the oil cooler seals myself. I know most people would not take on this task (I was apprehensive at first), but it was actually not as bad as I thought it would be. As for the CDI, they too have known problems. None of them scare me, nor would they keep me from owning/enjoying another one, should the need arise. I, like many others here have and have had very enjoyable experiences with the W211 platform. I personally would stay away from the gas version though. The one nice thing (among many others) about the '07, is it does not have the AdBlue system. I also like the interior color better than that of the '05-'06. I suggest getting the best CDI you can afford, you won't have any regrets.
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  #17  
Old 07-12-2018, 12:34 PM
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Join Date: Jun 2018
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Quote:
Originally Posted by ROLLGUY View Post
I have had two '05 CDI's (still in the immediate family though), and have an '07 Bluetec now (I got such a good deal on the Bluetec, I could not pass it up). As far as the engine goes, the OM648 is probably the last "best" Diesel engine made in my opinion. The inline six is a powerhouse, and still delivers great economy. It is fairly easy to work on as well. I had to replace the SBC in one of the CDI's, but as previously stated, it was not a big deal. Doing the job myself (mostly) only cost around $600. I would have no problem keeping and driving a CDI for many hundreds of thousand's of miles. Agreed about getting an MB specific scan tool. Even if you don't do your own work, it is good to know what is going on before having something repaired. It is easy to get ripped off. As far as the '07 and newer, they have their problems as well, but they are well known. Being a DIY guy, I was able to replace the oil cooler seals myself. I know most people would not take on this task (I was apprehensive at first), but it was actually not as bad as I thought it would be. As for the CDI, they too have known problems. None of them scare me, nor would they keep me from owning/enjoying another one, should the need arise. I, like many others here have and have had very enjoyable experiences with the W211 platform. I personally would stay away from the gas version though. The one nice thing (among many others) about the '07, is it does not have the AdBlue system. I also like the interior color better than that of the '05-'06. I suggest getting the best CDI you can afford, you won't have any regrets.
Thank you for the advice! I am prepared to do a few things myself and will look into the scanner / diagnostics clone. I do have a very reliable local workshop that specializes in Mercedes. I trust the guy but as you said, it would be good to know what's going on.

My 2 main drivers ('06 R350 and '08 ML550) have cost me $12k in repairs alone during the past 15 months. I cannot afford to continue spending this much on repairs but more importantly, I need reliable vehicles to be able to get my daughter to the hospital quickly whenever the need arises. Fighting leukemia is a very tough battle. I cannot jeopardize her recovery with unreliable cars because living in a rural area we really depend on having wheels available at all times.

Great forum! Thank you again.
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  #18  
Old 07-12-2018, 01:00 PM
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Location: Barrington, RI
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My CDI was exceptionally well maintained by the PO when I bought it in 2015 with 146k miles. It now has 172k miles. Other than fluids and filters, all I've had to do is replace the SBC battery and one glow plug. While I'm sure some big ticket items with be in my future, I fully expect it to be one of the most reliable cars I've ever owned.

So sorry to hear about your daughter's battle...must be unimaginably difficult for your family.
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06 E320 CDI "Benson", Platinum Blue, 173k mi, DD
91 300D "Otis", Smoke Silver, 127k mi, other DD
98 E300 "Murray", Silver, 125k mi, Stage 2 Rocketchip chip tuned, son's DD

Twelve other MB's owned and sold
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  #19  
Old 07-12-2018, 01:27 PM
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A common failure with the CDI is the water pump. It is a fairly easy job, so most anyone with some skills can do it. The belt, tensioner, and idler pulleys should be replaced as well. All the parts are a little over $200, and the job takes about an hour.

The CDI has the 722.6 transmission, and is much more DIY friendly than the '07 and newer 722.9. Basic maintenance and repairs are totally DIY on these cars. Although having a Star Diagnostic tool would be nice, the iCarsoft MB II has been an invaluable tool for me. With the exception of bleeding the SBC brakes (had an independent Euro shop do it after installing the rebuilt SBC unit), the MB II has done everything I have needed it to do on all three W211's that I have owned......Rich
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  #20  
Old 07-12-2018, 01:45 PM
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Originally Posted by shertex View Post
My CDI was exceptionally well maintained by the PO when I bought it in 2015 with 146k miles. It now has 172k miles. Other than fluids and filters, all I've had to do is replace the SBC battery and one glow plug. While I'm sure some big ticket items with be in my future, I fully expect it to be one of the most reliable cars I've ever owned.

So sorry to hear about your daughter's battle...must be unimaginably difficult for your family.
Thank you. I'll post tomorrow after I've seen the car.
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  #21  
Old 07-12-2018, 01:47 PM
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Join Date: Jun 2018
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Quote:
Originally Posted by ROLLGUY View Post
A common failure with the CDI is the water pump. It is a fairly easy job, so most anyone with some skills can do it. The belt, tensioner, and idler pulleys should be replaced as well. All the parts are a little over $200, and the job takes about an hour.

The CDI has the 722.6 transmission, and is much more DIY friendly than the '07 and newer 722.9. Basic maintenance and repairs are totally DIY on these cars. Although having a Star Diagnostic tool would be nice, the iCarsoft MB II has been an invaluable tool for me. With the exception of bleeding the SBC brakes (had an independent Euro shop do it after installing the rebuilt SBC unit), the MB II has done everything I have needed it to do on all three W211's that I have owned......Rich
Thank you, that is very encouraging! Do you know if the transmission shifter is electronic or if it is good old mechanical linkage?
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  #22  
Old 07-12-2018, 01:56 PM
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Originally Posted by Don Andres View Post
Thank you, that is very encouraging! Do you know if the transmission shifter is electronic or if it is good old mechanical linkage?
It is both. It has a mechanical connection from the shifter to the trans for selecting from park to drive. Manually shifting through the gears is done electronically. If needed, the conductor plate replacement is a DIY job. Also, the range selector switch in the shifter can go bad (intermittently), and cause the car not to shift out of low. This problem can be mistakenly assumed to be a conductor plate problem, so be aware- that may not be the case.
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  #23  
Old 07-12-2018, 02:02 PM
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Quote:
Originally Posted by ROLLGUY View Post
It is both. It has a mechanical connection from the shifter to the trans for selecting from park to drive. Manually shifting through the gears is done electronically. If needed, the conductor plate replacement is a DIY job. Also, the range selector switch in the shifter can go bad (intermittently), and cause the car not to shift out of low. This problem can be mistakenly assumed to be a conductor plate problem, so be aware- that may not be the case.
Sounds a lot less troublesome than the electronic shifters I have now....

Thanks for the info!
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