BlueEfficiency/BlueTec

DSK

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CLS 320 CDI, S350 Bluetec
Wow! thanks so much for all the info and opinions, it has been really helpful.

I understand that there can be a problem with an oil cooler seal on the V6 diesel, was this issue rectified after a certain year/VIN? Or is it only rectified by the replacement seal?

Whilst I don’t know the answer to that, it’s a common repair and budget £700-1200 to have it done. I wouldn’t let this be a worry in any way on a tried and tested v6 engine that’s been standing the test of time. You can easily spend more than that chasing repeat niggles and failures on other models and marques regularly!


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Droverunner

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2007 CLK 220 CDi Sport. 2012 Viano 3.0 CDi
As far as I've read... and with a 2012 I hope there's more than a bit of truth in it... the oil cooler seals were improved sometime in/after 2010 from the orange ones to an upgraded purple type which resits engine heat far better. However I don't think they are ever completely immune if you are unlucky.
 
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pace

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2003 ML 270 & 2006 A 150 SE
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Indeed DSK, I don't expect a 10+ year old car to be trouble free. My 163 has thrown a few bills of this size at me over the last 10 years, its all part of the running cost (and goes through by business).
I just want to have the expectation that if I can find a good one, and look after it, it will start every morning and keep going for a reasonable amount of time!
 

malcolm210

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I think it’s fair to say even with the purple Viton seals fitted to the OM642 oil cooler it may still develop a leak.
My 2012 E350cdi (which should have the Viton seals) has a small leak that I have checked at MOT just to make sure it’s not going to be a problem over the next year, the car has covered 77k miles faultlessly but the seals will require doing at some point probably <100k miles
 

Wighty

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W211/E320cdi/2009 and CLK200k 2009
Wow! thanks so much for all the info and opinions, it has been really helpful.

I understand that there can be a problem with an oil cooler seal on the V6 diesel, was this issue rectified after a certain year/VIN? Or is it only rectified by the replacement seal?
My 2009 E320cdi W211 on 118k isn’t leaking at the cooler seal …..yet .
 

DSK

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Your Mercedes
CLS 320 CDI, S350 Bluetec
Indeed DSK, I don't expect a 10+ year old car to be trouble free. My 163 has thrown a few bills of this size at me over the last 10 years, its all part of the running cost (and goes through by business).
I just want to have the expectation that if I can find a good one, and look after it, it will start every morning and keep going for a reasonable amount of time!

Be patient for the right one and it should serve well. With German stuff they take me the longest to find as so many are out there and the cars can hide the antics of the crooks well. Sounds like you’ll be fine as usually people these days just want a car to use and abuse rather than appreciate that stuff is only as good as its maintained (and built in the first place).


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