Oil in intake.
Newbie
Joined: Jan 2019
Posts: 2
Likes: 0
E350
If M276 engine I would not worry to much, ran into same problem before the answer I got from MB tech was "pcv design is not perfect" after digging around and asking conclusion was pcv system regulates by pushing oil back into intake. Hope this helps
MBWorld Fanatic!
Joined: Oct 2014
Posts: 1,053
Likes: 347
2011 E-350 4Matic Sport
That's a fair amount of oil. Problem is that not only can it foul the MAF sensor but it winds up as a carboned buildup on the air intake flaps. These are known to eventually stop being able to respond to the control diaphragms, causing CEL and sometimes breakage of the diaphragm pivot or link rods. Either way it's an intake replacement.
Suggest replacement of the pcv oil separator unit. It's on the back of the passenger side V6 cylinder head. Some places like FCPEuro sell the parts as an entire kit. Here's procedure.
Suggest replacement of the pcv oil separator unit. It's on the back of the passenger side V6 cylinder head. Some places like FCPEuro sell the parts as an entire kit. Here's procedure.
Last edited by Mud; Jan 11, 2019 at 10:08 AM.
Junior Member
Joined: Jul 2024
Posts: 50
Likes: 10
From: UK, Oxfordshire
C350 NA
That's a fair amount of oil. Problem is that not only can it foul the MAF sensor but it winds up as a carboned buildup on the air intake flaps. These are known to eventually stop being able to respond to the control diaphragms, causing CEL and sometimes breakage of the diaphragm pivot or link rods. Either way it's an intake replacement.
Suggest replacement of the pcv oil separator unit. It's on the back of the passenger side V6 cylinder head. Some places like FCPEuro sell the parts as an entire kit. Here's procedure.
Suggest replacement of the pcv oil separator unit. It's on the back of the passenger side V6 cylinder head. Some places like FCPEuro sell the parts as an entire kit. Here's procedure.
Out Of Control!!
Joined: Apr 2019
Posts: 12,214
Likes: 6,898
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
the root cause of oil in intake may not be failed PCV... It depends on mileage low/mid/high.
BTW it's also associated to $10k OIH... not just dirty valves
BTW it's also associated to $10k OIH... not just dirty valves
