oil filter housing leak (cross post)
Thread Starter
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,118
Likes: 271
'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
oil filter housing leak (cross post)
Sorry cross posting this but I think I'll get more answers here as it is for the same engine.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
Out Of Control!!
Joined: Apr 2019
Posts: 11,951
Likes: 6,796
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Sorry cross posting this but I think I'll get more answers here as it is for the same engine.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
What your current mileage on what engine type?
Senior Member
Joined: Dec 2018
Posts: 285
Likes: 60
From: New York
2010 E350 4Matic sedan
Sorry cross posting this but I think I'll get more answers here as it is for the same engine.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,118
Likes: 271
'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
Senior Member
Joined: Sep 2019
Posts: 266
Likes: 305
2011 Mercedes E350 4Matic Wagon
I had a leaking oil cooler housing on my 2011 at 121k miles. I had previously replaced the thermostat at 90k miles due to it failing and had changed the belt, pulleys, tensioner and coolant while I had the car apart to work on the thermostat. My next job on the vehicle when the time arises is water pump...it is original factory. If you plan on keeping the car for the long term, as I do, I would do all the repairs you mentioned and possibly the water pump because of "while you're there". I exclusively order my parts from FCP Euro if its available because of their lifetime warranty on their parts.
Out Of Control!!
Joined: Apr 2019
Posts: 11,951
Likes: 6,796
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
PREVENTIVE MAINTENANCE
Sorry cross posting this but I think I'll get more answers here as it is for the same engine.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204.
I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers?
Thinking of going to FCP Euro or ECS tuning.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204.
I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers?
Thinking of going to FCP Euro or ECS tuning.
You see your oil heat-exchanger leaking and want to fix it with neglected coolant service.
I think its fair to say this car has done a lot of inactive sitting (50K.Km in 15Yr) on original coolant... that's opportunities for pinholes in skinny-thin metals like heat-echanger, heater-core and radiator.
Anything rubber benefits being refreshed. Luckily seals are not rubber more like silicone based materials.
The two leaks that will send your car to its junkyard retirement are engine-mayo and tranny-mayo (RIP: Engine/tranny) where coolant gets mixed up.
Age is a factor but engine oiling affects hear removal. Do not stick to extended thin oil service. Replace better oil grade sooner to keep engine heat under better control (~ 5kMi).
FCP Euro has a lot of good parts and junk ones as well. It's not only great German parts...
So your parts list looks like this:
- new Serp belt kit (tens. + belt + idlers)
- new thermostat with O-rings
- new oil heat echanger with gasket
- new gasket for oil filter/exchanger
- (new engine radiator!)
At some point you're going to visit :
- ignition plugs + boots (+ coils)
- ALL front suspension parts:
- control arms,
- stab links,
- ball joints,
- strut bearings,
- ...
Last edited by CaliBenzDriver; Feb 22, 2025 at 10:06 PM.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,118
Likes: 271
'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
2010 V6-NA 50K.Km 15Yr old coolant
You see your oil heat-exchanger leaking and want to fix it with neglected coolant service.
I think its fair to say this car has done a lot of inactive sitting (50K.Km in 15Yr) on original coolant... that's opportunities for pinholes in skinny-thin metals like heat-echanger, heater-core and radiator.
Anything rubber benefits being refreshed. Luckily seals are not rubber more like silicone based materials.
The two leaks that will send your car to its junkyard retirement are engine-mayo and tranny-mayo (RIP: Engine/tranny) where coolant gets mixed up.
Age is a factor but engine oiling affects hear removal. Do not stick to extended thin oil service. Replace better oil grade sooner to keep engine heat under better control (~ 5kMi).
FCP Euro has a lot of good parts and junk ones as well. It's not only great German parts...
So your parts list looks like this:
At some point you're going to visit :
You see your oil heat-exchanger leaking and want to fix it with neglected coolant service.
I think its fair to say this car has done a lot of inactive sitting (50K.Km in 15Yr) on original coolant... that's opportunities for pinholes in skinny-thin metals like heat-echanger, heater-core and radiator.
Anything rubber benefits being refreshed. Luckily seals are not rubber more like silicone based materials.
The two leaks that will send your car to its junkyard retirement are engine-mayo and tranny-mayo (RIP: Engine/tranny) where coolant gets mixed up.
Age is a factor but engine oiling affects hear removal. Do not stick to extended thin oil service. Replace better oil grade sooner to keep engine heat under better control (~ 5kMi).
FCP Euro has a lot of good parts and junk ones as well. It's not only great German parts...
So your parts list looks like this:
- new Serp belt kit (tens. + belt + idlers)
- new thermostat with O-rings
- new oil heat echanger with gasket
- new gasket for oil filter/exchanger
- (new engine radiator!)
At some point you're going to visit :
- ignition plugs + boots (+ coils)
- ALL front suspension parts:
- control arms,
- stab links,
- ball joints,
- strut bearings,
- ...
1. Oil filter housing (MB) + bolts
2. Thermostat (Borg W) + coolant + bolts
3. Serpentine Belt kit (MB for the belt, OE for the idler and pulley) + bolts
4. Camshaft magnet x4 (MB) + bolts
5. Camshaft position sensor x4 (Bosch) + bolts
6. Coolant hose (upper and lower) (MB)
Since the bolts are alum. I rather not risk it and replace em as well.
What else did I miss?
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Out Of Control!!
Joined: Apr 2019
Posts: 11,951
Likes: 6,796
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
ENGINE TIPS
I've already tackled the tranny last year. New mounts, flush and the differentials. First sign that gaskets starts replacement is when I replaced the oil separator valve few months ago. Before that zero leaks. I know things will start leaking and it is just a matter of WHEN. I yanked the engine cover this afternoon noticed that I also have leaks now on the cam magnets and cam positioning sensors. Hopefully no leak in the harness yet. Touched the sides of the valve cover and dry as a desert. So I think the parts list just got bigger. The suspension is still in good shape no clunking yet but I am sure that will be next to go so I will surely look out for those cheaper monroe shocks as my car has the agility control damping and from what I heard dealer asked for a kidney for these. I will check the radiator hose and might as well replace that while I am at it so the shopping cart:
1. Oil filter housing (MB) + bolts
2. Thermostat (Borg W) + coolant + bolts
3. Serpentine Belt kit (MB for the belt, OE for the idler and pulley) + bolts
4.Camshaft magnet x4 (MB) + bolts
5. Camshaft position sensor x4 (Bosch) + bolts
6. Coolant hose (upper and lower) (MB)
Since the bolts are alum. I rather not risk it and replace em as well.
What else did I miss?
1. Oil filter housing (MB) + bolts
2. Thermostat (Borg W) + coolant + bolts
3. Serpentine Belt kit (MB for the belt, OE for the idler and pulley) + bolts
4.
5. Camshaft position sensor x4 (Bosch) + bolts
6. Coolant hose (upper and lower) (MB)
Since the bolts are alum. I rather not risk it and replace em as well.
What else did I miss?
> When you deal with replacing your 4x CPS... do the 2X chain TENSIONERS and reseal the timing cover (FCPe has a good kit for that job with MBsealer).
-- VVT solenoid magnets likely ok! (double-check for connector leak).
-- You want to install cheap sacrificial PIGTAILS to CPS + VVT Sols. 4Pcs.3wires + 4Pcs.2wires
> Under serpentine topic:
the killer is the tensioner itself + belt + idlers pulleys.
> oil filter housing: GASKET only.
Also you mention your engine starting to suffer high crankcase internal pressure ... this is associated with leaky pistons rings due to long burnt oil interval. Replace near 4 ot 5kMi, NOT 10KMi!!
Last edited by CaliBenzDriver; Feb 23, 2025 at 03:03 AM.
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Junior Member
Joined: Dec 2014
Posts: 34
Likes: 1
From: Minneapolis/St Paul
2014 E550
Sorry cross posting this but I think I'll get more answers here as it is for the same engine.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
I just noticed an oil leak on the oil filter housing. Not sure if it is on the oil cooler or housing to be honest but I know it is coming there as I had that before on the W204. I want to tackle this DYI and I want to get advice on the following:
1. Do I just replace the 2 gaskets or replaced the entire assembly? that is a $40 gasket kit or a $400 part.
2. Do I replace the thermostat while I am at it?
3. Do I replace the belt and the belt tensioner while I am it?
4. I am assuming it is best to flush the coolant as I think it still has the original coolant.
5. What else should I replace as preventive maintenance while I am tackling this job?
6. If you have done this job before can you post part numbers? Thinking of going to FCP Euro or ECS tuning.
The housing, thermostat and turbo cooling lines were replaced because they were brittle and one broke off.
Wasn't a cheap fix.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,118
Likes: 271
'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
Will do this in the next couple of weeks. Does anyone know the part numbers for the bolts and what torque (oil filter housing, pulleys, tensioner and thermostat) I need to fasten em?
Junior Member
Joined: Jan 2025
Posts: 21
Likes: 8
w164 ml350
Thermostat 25
belt tensioner 35
guide pulleys 25
Oil filter housing to block 20
oil cooler to oil filter housing 12
Edited to add, the camshaft position sensors have a cheap o-ring that can be replaced which will stop any leaking (Bosch 1230210027), much cheaper than buying the sensor.
Last edited by beef1020; Mar 25, 2025 at 01:24 PM.
Thread Starter
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,118
Likes: 271
'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
I don't think you need to get new bolts for any of this, they are not single use. On the M273/m272 the torque specs for the front of engine bits are (NM):
Thermostat 25
belt tensioner 35
guide pulleys 25
Oil filter housing to block 20
oil cooler to oil filter housing 12
Edited to add, the camshaft position sensors have a cheap o-ring that can be replaced which will stop any leaking (Bosch 1230210027), much cheaper than buying the sensor.
Thermostat 25
belt tensioner 35
guide pulleys 25
Oil filter housing to block 20
oil cooler to oil filter housing 12
Edited to add, the camshaft position sensors have a cheap o-ring that can be replaced which will stop any leaking (Bosch 1230210027), much cheaper than buying the sensor.
Newbie
Joined: Feb 2020
Posts: 2
Likes: 0
GL320cdi
I replaced my 2 seals on the GL320CDI 2007 model. Bought them on Aliexpress and they did the job and cost very little.
6421840080 6421801410 Rubber Oil Filter Housing - Buy 6421840080 6421801410 Rubber Oil Filter Housing with free shipping on AliExpress
6421840080 6421801410 Rubber Oil Filter Housing - Buy 6421840080 6421801410 Rubber Oil Filter Housing with free shipping on AliExpress
