E350 Wagon - oil puddle behind Throttle Body
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Joined: Aug 2018
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2011 E350
E350 Wagon - oil puddle behind Throttle Body
My E350 wagon started getting a "hot" oil smell coming from the engine bay.. no leaks on the under tray but I found a puddle of oil right behind the throttle body, it was difficult to see any source - has anyone had this issue? thanks!
Out Of Control!!
Joined: Apr 2019
Posts: 11,997
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
OILY ENGINE SMELL
The engine oil issues are produced by vaporizing oil over the superheated pistons.
Mercedes added a sort of catch-can to the throttle body to conveniently capture oil leaking back out. You'll want to get this emptied out during annual service.
What type of engine oil are you using?
Try to use an "MB Approved" oil with more stable viscosity, replaced at 5kMi will help.
Do not use 10kMi intervals !!!
MBWorld Fanatic!
Joined: May 2012
Posts: 2,360
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From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
Also if you chose to use 5W40 or 10W40 this would happen less as the higher viscosities tend to vaporize slower, unless you are in the great white north with temps below zero F.
Junior Member
Joined: Dec 2023
Posts: 56
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E350
The crankcase valve may need to be replaced.
https://www.fcpeuro.com/products/mer...eal-2720100631
This usually drips oil onto the cat causing an oil smell in the cabin.
https://www.fcpeuro.com/products/mer...eal-2720100631
This usually drips oil onto the cat causing an oil smell in the cabin.
