M-Class (W166) Produced 2012-2015

Oil in Harnesses-Fixed?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Dec 12, 2025 | 10:04 PM
  #1  
Brent S's Avatar
Thread Starter
Junior Member
5 Year Member
Liked
 
Joined: May 2017
Posts: 41
Likes: 2
From: Long Island, NY
2014 ML350 4MATIC
Oil in Harnesses-Fixed?

I’ve been reading about the oil in harness issue, and noticed my harnesses for camshaft solenoids and camshaft position sensors seem to have breaks in the outer jacket, near the connectors.
Did Mercedes already make changes in my 2014 ML350 to prevent this destructive phenomenon?
I don’t see how oil would get pumped through this type of harness, with the breaks in there….




Last edited by Brent S; Dec 12, 2025 at 10:07 PM.
Reply
Old Dec 13, 2025 | 08:44 AM
  #2  
Leetom's Avatar
Member
10 Year Member
Liked
 
Joined: Jan 2013
Posts: 190
Likes: 76
2013 ML550 US spec. Air+Offroad pkg
The oil actually gets in and travels via capillary action inside the wire between strands and the insulation, not the jacket. Pull connectors off and look inside those for oil.
Reply
Old Dec 14, 2025 | 07:01 AM
  #3  
GTIBlack's Avatar
Banned
 
Joined: Nov 2025
Posts: 477
Likes: 187
From: US
Mercedes SL R231
This is what you want. Ignore the engine reference. They work with all engines.

https://a.co/d/djSaqtC


Reply
Old Dec 16, 2025 | 09:57 AM
  #4  
Brent S's Avatar
Thread Starter
Junior Member
5 Year Member
Liked
 
Joined: May 2017
Posts: 41
Likes: 2
From: Long Island, NY
2014 ML350 4MATIC
I was going to buy the camshaft solenoid part, and the online dealer parts sites claim that the part number “doesn’t fit” my 2014 ML350 ….?
276-156-07-90
Reply
Old Dec 16, 2025 | 02:29 PM
  #5  
W205C43PFL's Avatar
MBWorld God!
 
Joined: Dec 2019
Posts: 33,393
Likes: 6,623
It is definitely still a thing even on later model years equipped with M276.
Reply
Old Dec 17, 2025 | 08:56 AM
  #6  
GTIBlack's Avatar
Banned
 
Joined: Nov 2025
Posts: 477
Likes: 187
From: US
Mercedes SL R231
Originally Posted by Brent S
I was going to buy the camshaft solenoid part, and the online dealer parts sites claim that the part number “doesn’t fit” my 2014 ML350 ….?
276-156-07-90
FCP Euro says it does fit. Gotta check more than one source.

https://www.fcpeuro.com/products/mer...0790kt#fitment

Reply
Old Dec 17, 2025 | 05:03 PM
  #7  
CaliBenzDriver's Avatar
Out Of Control!!
Community Builder
Community Influencer
Liked
Community Favorite
 
Joined: Apr 2019
Posts: 12,252
Likes: 6,912
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
oil in harness

Originally Posted by Brent S
I was going to buy the camshaft solenoid part, and the online dealer parts sites claim that the part number “doesn’t fit” my 2014 ML350 ….?
276-156-07-90
inspect actual parts for leaks...
Point being that solenoids are not primary leakers but Cam sensors are guaranteed to leak.

-- Short term remedy is new sensor + sacrificial extension.
-- Long term fix is prevent the extreme heat accumulation.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 12:31 AM.

story-0
New Mercedes-AMG SUVs Arrive With NEW V8 Engine: 12 Things You Need to Know

Slideshow: Mercedes-AMG's updated GLE 63 S and GLS 63 bring a new-generation V8, subtle design revisions, and familiar supercar-rivaling performance figures.

By Verdad Gallardo | 2026-06-17 12:52:51


VIEW MORE
story-1
8 Oddball Mercedes Ideas That Actually Made it to Production

Slideshow: Mercedes has never been afraid to experiment, and some of its strangest ideas turned out to be surprisingly successful.

By Verdad Gallardo | 2026-06-10 17:43:40


VIEW MORE
story-2
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look

Sideshow: A Middle Eastern tuner has transformed the Mercedes-AMG G 63 into an open-top special, replacing nearly every exterior panel in the process.

By Verdad Gallardo | 2026-06-10 15:29:50


VIEW MORE
story-3
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish

Slideshow: Six gift ideas your AMG loving dad or grad will cherish.

By | 2026-06-03 17:26:18


VIEW MORE
story-4
7 Craziest Things AMG Gas Ever Built

Slideshow: Sometimes AMG builds fast sedans. Other times, it builds twin-turbo V12 land missiles and six-wheeled off-road monsters.

By Verdad Gallardo | 2026-05-26 17:59:58


VIEW MORE
story-5
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-6
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-7
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-8
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-9
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE