Quote:
Originally Posted by Graham
Read all you can about the Bluetec emission system before you buy one. They are not like the MB diesels we love.
I don't know that particular car, but I just traded my 2014 GLK Bluetec with just 50k km. Reason - many reports of failures of NOx sensors, DPFs, Adlue injection components and even total engine failures caused by excessive heat during DPF regeneration. Most of those items are not covered by even the new car warranty, except for first few years. Don't assume anything is covered without first checking!
If I was to buy another diesel it would have to be a pre-Bluetec CDI.
Some owners have illegally "tuned" the Bluetecs. Probably only way to keep them running without excessive costs. ("tuning" is a euphemism for gutting the exhaust emission system)
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After reading a two hour long post on MB World about the sludging problem with these engines,
https://mbworld.org/forums/diesel-forum/585587-another-2010-ml350-bluetec-engine-seized.html I would agree. I personally would stay away from anything 2009 and newer. However, if you can be sure that no sludge is present, and keep the drain intervals at around 5k, use the proper ESP oil, you probably will be okay. You definitely don't want catastrophic engine failure caused by sludge from using the wrong oil, and extended drain intervals. My opinion is that any "aftermarket" extended warranty is not worth the paper it is written on. Their job is to find a way to NOT pay a claim. It will be even harder if you do your own oil changes.
Photos of an OM642 oil pan and bottom of engine.