M271 Blow by from oil cap- is this normal?
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Junior Member
Joined: Feb 2019
Posts: 18
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W203 M271 2004 C200
M271 Blow by from oil cap- is this normal?
Hi this is my first time I post in this great forum and thanks for all in advance.
I tried to top up engine oil today with 0.5 liter after 5000 km from last change which I believe to be normal consumption. But I noticed air with exhaust smell blowing from the cap as shown. I have no issue and the car runs fine with no MEL. Is this normal or should I do any maintenance?
I tried to top up engine oil today with 0.5 liter after 5000 km from last change which I believe to be normal consumption. But I noticed air with exhaust smell blowing from the cap as shown. I have no issue and the car runs fine with no MEL. Is this normal or should I do any maintenance?
Last edited by Alaqil; Mar 4, 2019 at 02:37 AM.
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Joined: Nov 2016
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From: San Francisco, CA
Currently: 2005 C240 4matic wagon. Previously: 2001 C320 sedan.
I would listen to the mechanic and do an oil flush and see if that helps. You're probably just experiencing engine blow by which would be part of the reason you are adding oil in between service intervals. Some of this is normal, too much is a bad sign. If the engine flush doesn't help, you may want to consider some other temporary band-aids out there for oil additives to reduce oil consumption.
Hard to provide any advice without knowing how many miles/kms are on your Merc... Eventually, every car must die. Even if you start to see high oil consumption/blow by, you might be able to ride it out for a long time. At this point, it isn't worth much anyway so it can't hurt to try an squeeze out as much life as possible from your M271.
Hard to provide any advice without knowing how many miles/kms are on your Merc... Eventually, every car must die. Even if you start to see high oil consumption/blow by, you might be able to ride it out for a long time. At this point, it isn't worth much anyway so it can't hurt to try an squeeze out as much life as possible from your M271.
Thread Starter
Junior Member
Joined: Feb 2019
Posts: 18
Likes: 2
W203 M271 2004 C200
Many thanks for all of you. I was wondering why my previous Hyundai Accent not doing this. It seems they are away different and not from the same school..
Last edited by Alaqil; Mar 25, 2019 at 07:17 AM.
