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My 2019 GLC300 has 90k miles, all mine from original purchase. at about 40k miles I had intermittent Check Engine light come and go for weeks at a time. When I took it in they said that it was throwing a code for the PCV valve but at the time the light was off and I moved on, the light stayed off until about 2 weeks ago. So about 50k miles later but same code and this time it isn't clearing itself. Also had service tech manually clear it and it came back on fairly quickly. Car is running fine, if that matters.

My question is as follows. I can't find anything on a PCV valve specific to my car, MB dealer tells me that my car has a Crankcase Oil Separator and not a PCV valve and that it will require 8 hours service to replace. I also can't find anything online about an Oil Separator specific to my car, not a single part or discussion, article, anything.

Can someone here help me understand my options? I am not afraid to get my hands dirty if it will save me a significant amount of money, but alternatively if the part (whatever it likely is) can be manipulated back into working order rather than replaced that could be a better option for me. I am trading the vehicle in to MB in 1 month and want the light off so that my trade in value wont be impacted.

Thanks in advance.
 

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My 2018 GLC300 has only ~36k miles and my Check Engine light came on a few weeks back. It was due for a service and so I waited. The service happened today and feedback from the service center is to replace Crankcase Valve / Oil Separator. The cost: ~$2k. They did not have the parts and therefore I need to go back again.

I was wondering why such a high cost!!! And I found this post... 8 hours service, possibly that's why. I will keep watching this thread to see if there is any alternative suggestion.
 

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Dealing with this exact issue now on a 2018 GLC 300 4 Matic with 68000 miles.

Was also told the same thing about the Crankcase Oil Separator and not the valve.

I have seen on some other models that there is separate valve part for $40 (
). Was hoping to find that as a quick fix to try before spending $2k. I can't find this part!
 

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I have a 2015 C300 (68k) which is on its 3rd PCV assembly, and my wife's 2017 GLC300 (52k) is on its second. Only had to pay for one so far because of warranties and a little bit of "assertiveness" with the person at the dealership.

I have done a lot of my own repairs on previous Mercedes we've owned, but some genius engineer put the PCV assembly in a location where it gets a lot of heat, and is almost impossible for a backyard mechanic to repair.
 
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