W221 S65 Oil leak
Thread Starter
Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
W221 S65 Oil leak
Hi all
I have a fairly large oil leak on my 221. Its making a mess of my driveway!
I cleaned up the underside of the car, then I drive 200 miles and its covered again. Seems to be worse on the left side of the engine
(passenger side in the UK, drivers side across the pond).
Thinking it may be the turbo oil drain, but that thing in the picture doesn't look like it to me?
Left turbo wastegate actuator:
I have a fairly large oil leak on my 221. Its making a mess of my driveway!
I cleaned up the underside of the car, then I drive 200 miles and its covered again. Seems to be worse on the left side of the engine
(passenger side in the UK, drivers side across the pond).
Thinking it may be the turbo oil drain, but that thing in the picture doesn't look like it to me?
Left turbo wastegate actuator:
Last edited by alexanderfoti; Oct 4, 2017 at 11:16 AM.
Thread Starter
Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
OK so its the oil cooler thermostat that is bolted to the side of the block.
If I clean the oil off and start the engine, oil appears between the pressed metal plate, and the body of the housing (where the droplet is in the last picture of the car).
I think its going to be obvious that its probably the gasket to the block that is leaking, and no easy way of changing other than removing the engine?
If I clean the oil off and start the engine, oil appears between the pressed metal plate, and the body of the housing (where the droplet is in the last picture of the car).
I think its going to be obvious that its probably the gasket to the block that is leaking, and no easy way of changing other than removing the engine?
Thread Starter
Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
Thanks Nick.
I assume to do this, I would have to disconnect all the suspension and cooling pipes etc?
So far I have managed to remove the left engine mount and 3 of the 4 bolts on the left mount bracket. Just waiting on a set of torx spanners to get the last one out. I can then hopefully gain access to that side piece that is leaking.
I assume to do this, I would have to disconnect all the suspension and cooling pipes etc?
So far I have managed to remove the left engine mount and 3 of the 4 bolts on the left mount bracket. Just waiting on a set of torx spanners to get the last one out. I can then hopefully gain access to that side piece that is leaking.
Last edited by alexanderfoti; Jun 20, 2018 at 05:36 AM.
MBWorld Fanatic!
Joined: Nov 2010
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From: Welwyn, Herts, UK
2006 S600
It sounds like you're close as you are, good luck.
Nick
Thread Starter
Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
Ah yes I see! I thought you meant dropping the engine with the Front subframe for some reason!
Yes that's the one! Front upper bolt. Am hoping that an offset torx spanner will fit. I will then remove the plate and hope that the oil leak is actually from there and that there is an o ring there.
If it's from the ring between the block and the oil cooler then the turbo will have to come off. I assume I can get access to do that by dropping the subframe as you recommend?
Yes that's the one! Front upper bolt. Am hoping that an offset torx spanner will fit. I will then remove the plate and hope that the oil leak is actually from there and that there is an o ring there.
If it's from the ring between the block and the oil cooler then the turbo will have to come off. I assume I can get access to do that by dropping the subframe as you recommend?
MBWorld Fanatic!
Joined: Nov 2010
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From: Welwyn, Herts, UK
2006 S600
Yes, that's how I removed my turbos a couple of years ago, but lets hope it doesn't come to that.
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W215 CL65
Just FYI, that gasket cannot be changed without removing the front timing cover. Has to do with bolt location (inside and underneath the bracket that holds abc pump. (like 100%). I bought the gasket when I was doing other work and ended up not being able to change as I didn't prepare to remove timing cover.
Best,
Thread Starter
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Joined: Mar 2010
Posts: 643
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From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
Thanks mooks.
Its actually leaking on the side plate that contains the three torx bolts.
I managed to get it off yesterday, had to remove the mount, mount bracket and the wastegate actuator as one of the 3 torx bolts rounded off. Having removed it, its clear that somebody else has been there before and replaced the o ring with one that is too small!
I am thinking of replacing the hard to get at e Torx bolt with a stud and nut so that its easier to get on...
Its actually leaking on the side plate that contains the three torx bolts.
I managed to get it off yesterday, had to remove the mount, mount bracket and the wastegate actuator as one of the 3 torx bolts rounded off. Having removed it, its clear that somebody else has been there before and replaced the o ring with one that is too small!
I am thinking of replacing the hard to get at e Torx bolt with a stud and nut so that its easier to get on...
Thread Starter
Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
All back together now. The stud in place of the troublesome E torx bolt worked well. Getting the nut started was tricky but a bit of grease and a screwdriver helped with that.
Thread Starter
Super Member
Joined: Mar 2010
Posts: 643
Likes: 72
From: London UK
2013 W204 C63 AMG, 2008 W221 S65 AMG
Having fixed that leak, its become clear the there is ALSO a leak at the o ring for the oil cooler pipe (that can be seen in the picture with the oil drop on it).
Its a much slower leak, so I am not so worried about it, just wonder if I can remove that line to replace the O ring. I can get to one bolt holding it on. Not sure on the other.
Its a much slower leak, so I am not so worried about it, just wonder if I can remove that line to replace the O ring. I can get to one bolt holding it on. Not sure on the other.
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Joined: Apr 2019
Posts: 428
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From: Houston
001 s600, 94 sl600
Oil Leak Hell! For all you folks experiencing numerous oil leaks on these V-12 engines, that is NOT NORMAL unless the engine has been run very hot and with too long oil changes.
I STRONGLY RECOMMEND "BLUE DEVIL Hydraulic leak stop. " This stuff WORKS WELL at reconditioning oil seals and 'rubber' gaskets---IF they are not cracked.
This is the ONLY such 'magic mouse milk' I ever suggest one use, and that is based on my personal experience with it in my 2001 S-600 ABC system, fixing the control valves leak-down issue.
I STRONGLY RECOMMEND "BLUE DEVIL Hydraulic leak stop. " This stuff WORKS WELL at reconditioning oil seals and 'rubber' gaskets---IF they are not cracked.
This is the ONLY such 'magic mouse milk' I ever suggest one use, and that is based on my personal experience with it in my 2001 S-600 ABC system, fixing the control valves leak-down issue.
Junior Member
Joined: Jun 2011
Posts: 53
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S65AMG V12 BiTurbo- Designo S63AMG V8 BiTurbo
Hi,
I know this is an old thread but I wanted to ask, has anyone removed the oil level sensor that is above the engine sump?
My car has a leak from the level sensor but I can't see any screws and I doubt it's just been pressed in. I think the O ring has failed.
I'm just thinking if it has been screwed in from inside and in order to take the sensor off I will need to remove the oil sump? [ Hopefully I won't have to remove the engine sump ]
Any advise would be much appreciated
I know this is an old thread but I wanted to ask, has anyone removed the oil level sensor that is above the engine sump?
My car has a leak from the level sensor but I can't see any screws and I doubt it's just been pressed in. I think the O ring has failed.
I'm just thinking if it has been screwed in from inside and in order to take the sensor off I will need to remove the oil sump? [ Hopefully I won't have to remove the engine sump ]
Any advise would be much appreciated
Senior Member
Joined: Apr 2019
Posts: 428
Likes: 96
From: Houston
001 s600, 94 sl600
oil level sensor leak
The oil pan must be removed to Rans R the level sensor. An alternative is to thoroughly clean around the sensor (drop the oil level first) with 'brake cleaner' and then apply a bead of silicon (RTV) sealer to seal the sensor to the oil pan. Be sure and allow the RTV to dry and cure completely before restoring the oil level and operating the car. A little work can save you several hundred dollars over the Dealer price for fixing the leak.
Hi,
I know this is an old thread but I wanted to ask, has anyone removed the oil level sensor that is above the engine sump?
My car has a leak from the level sensor but I can't see any screws and I doubt it's just been pressed in. I think the O ring has failed.
I'm just thinking if it has been screwed in from inside and in order to take the sensor off I will need to remove the oil sump? [ Hopefully I won't have to remove the engine sump ]
Any advise would be much appreciated
I know this is an old thread but I wanted to ask, has anyone removed the oil level sensor that is above the engine sump?
My car has a leak from the level sensor but I can't see any screws and I doubt it's just been pressed in. I think the O ring has failed.
I'm just thinking if it has been screwed in from inside and in order to take the sensor off I will need to remove the oil sump? [ Hopefully I won't have to remove the engine sump ]
Any advise would be much appreciated
MBWorld Fanatic!
Joined: Feb 2012
Posts: 2,627
Likes: 1,217
From: Phoenix
222 S-65
Hi,
I know this is an old thread but I wanted to ask, has anyone removed the oil level sensor that is above the engine sump?
My car has a leak from the level sensor but I can't see any screws and I doubt it's just been pressed in. I think the O ring has failed.
I'm just thinking if it has been screwed in from inside and in order to take the sensor off I will need to remove the oil sump? [ Hopefully I won't have to remove the engine sump ]
Any advise would be much appreciated
I know this is an old thread but I wanted to ask, has anyone removed the oil level sensor that is above the engine sump?
My car has a leak from the level sensor but I can't see any screws and I doubt it's just been pressed in. I think the O ring has failed.
I'm just thinking if it has been screwed in from inside and in order to take the sensor off I will need to remove the oil sump? [ Hopefully I won't have to remove the engine sump ]
Any advise would be much appreciated
I would DIY without hesitation.
Junior Member
Joined: Jun 2011
Posts: 53
Likes: 35
S65AMG V12 BiTurbo- Designo S63AMG V8 BiTurbo
The oil pan must be removed to Rans R the level sensor. An alternative is to thoroughly clean around the sensor (drop the oil level first) with 'brake cleaner' and then apply a bead of silicon (RTV) sealer to seal the sensor to the oil pan. Be sure and allow the RTV to dry and cure completely before restoring the oil level and operating the car. A little work can save you several hundred dollars over the Dealer price for fixing the leak.
Thank you for your reply!
I bought an O ring from Mercedes and now I will remove the oil pan. I just didn't know if the sensor was screwed from inside. Now it makes sense
Thanks again
Junior Member
Joined: Jun 2011
Posts: 53
Likes: 35
S65AMG V12 BiTurbo- Designo S63AMG V8 BiTurbo
