C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Help! Oil Leak Between Pulleys?

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Old Jan 3, 2026 | 08:25 PM
  #1  
Arlindii's Avatar
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2012 W204 C300 4Matic
Help! Oil Leak Between Pulleys?

So I Was Casually Looking At My Engine Bay When I Noticed This. Looks Like Oil And One Of The Pulleys (Thickest One) Was Kinda Wet. I Get Burnt Smell After I Park My Car or When Sitting In Traffic. I Suspect It's The Oil Cooler But Not Sure. Any Insight From Anyone Who Has Experienced This Would HELP A LOT...
I'm Actually Really Worried Lol
Here's A Video :
https://streamable.com/av3bf8

2012 W204 C300 4Matic 152k miles / 245k km
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Old Jan 3, 2026 | 08:52 PM
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From: Toronto, Canada
2010 GLK350 4matic
Oil filter housing gasket, also check pcv cover and cam plugs, those commonly leak and likely cause of smell as they drip on exhaust
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Old Jan 4, 2026 | 11:26 AM
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From: Auburn, GA
C250 2013
For my 2013 C250, the oil filter housing is on the other side.
This could be from the valve cover gasket or turbo line gasket.
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Old Jan 4, 2026 | 12:52 PM
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From: Northern Indiana
2014 c300 w204.080 3.5 v6
Oil filter gasket or o ring
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Old Jan 4, 2026 | 03:40 PM
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From: Walnut Creek, CA
325Ci, 325Cic, C300
From your profile that’s an M272 and I have the same engine. From that one picture I’d say oil filter housing gasket and heat exchanger gasket. Hurry it up. In extreme cases, the belt can jump when it’s wet enough. The N54 and N55 guys know this well.
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