Weird issue. Oil smoke after coil packs/plugs/VC. gaskets
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Newbie
Joined: Dec 2016
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s600 and cl600
Weird issue. Oil smoke after coil packs/plugs/VC. gaskets
Hi all, new guy here. I have a couple of v12TT cars, both 2003 cars, while one is a s600 and the other a cl600. Recently I started getting misfires at WOT on the s600, so I decided to go ahead and have both coil packs rebuilt by v12icpack and do plugs while I was in there. Once the coil packs were off I noticed the valve cover gaskets were leaking and filling the plug wells with oil, so then I decided I'd replace the valve cover gaskets as well.
The job went well, some oil got into the cylinders once I pulled the plugs because of the VC leaks, so I knew I'd get some smoke on initial start up. Well 150 miles later and two quarts of oil down tells another story and it looks like my problem is much worse than just a little oil that fell in the cylinders. I can't think of anything I did while replacing these components that would cause this amount of oil consumption, so I'm thinking it might just be a coincidence and maybe I blew a turbo seal, but before jumping to conclusions I thought I'd post up here first. Any ideas on something I could have broke "while in there" that would cause the car to eat a quart of oil every 75 miles or so?
I thought about dropping the exhaust before the merge, so I can at least narrow down the bank the consumption is coming from (if not both), but other than that I don't really have any ideas. I do have a STAR diagnostics setup, but am not sure it could be much help here.
Just as an fyi the s600 has 136k miles and is not throwing any codes. It also runs perfectly other than the smoke. Any ideas are much appreciated.
The job went well, some oil got into the cylinders once I pulled the plugs because of the VC leaks, so I knew I'd get some smoke on initial start up. Well 150 miles later and two quarts of oil down tells another story and it looks like my problem is much worse than just a little oil that fell in the cylinders. I can't think of anything I did while replacing these components that would cause this amount of oil consumption, so I'm thinking it might just be a coincidence and maybe I blew a turbo seal, but before jumping to conclusions I thought I'd post up here first. Any ideas on something I could have broke "while in there" that would cause the car to eat a quart of oil every 75 miles or so?
I thought about dropping the exhaust before the merge, so I can at least narrow down the bank the consumption is coming from (if not both), but other than that I don't really have any ideas. I do have a STAR diagnostics setup, but am not sure it could be much help here.
Just as an fyi the s600 has 136k miles and is not throwing any codes. It also runs perfectly other than the smoke. Any ideas are much appreciated.
Last edited by cottonyzf; Jan 3, 2017 at 03:40 PM.
Thread Starter
Newbie
Joined: Dec 2016
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s600 and cl600
Looks pretty good at the breather....just typical residue. It smokes all the times to varying degrees. Sometimes just light hazing but tip in after coasting or coasting after acceleration tends to make it worse. It also seems to clean up at wide open throttle.
Super Member
Joined: Nov 2010
Posts: 681
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Benz
Hard to say man. any chance oil returns got restricted when you had valve covers off? Any sludge in there? The old M137 V12 used to smoke on start up due to a clogged channel in the cam cover but haven't personally ran into your issue on a M275
Thread Starter
Newbie
Joined: Dec 2016
Posts: 9
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s600 and cl600
-Drop exhaust before the merge and see if one particular bank is smoking.
-If I isolate it to one bank - pulls those plugs and check for oil, although nothing is getting fouled enough to cause a misfire. If the plugs look okay, then pull the VC and check for proper drainage etc.
-If all that looks okay then I will probably pull the engine.
-If it looks like both banks are smoking then I'll re-think my plan.
Junior Member
Joined: Jul 2016
Posts: 41
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From: Easton, PA
04 ML500, 05 S600
If the smoke is coming from under the hood, then it could be possible that the valve cover gasket isn't seated properly and it's pissing out of there. That would explain the high amount of oil being used. It's a super long gasket and pretty easy to have an issue with it due to that.
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Thread Starter
Newbie
Joined: Dec 2016
Posts: 9
Likes: 0
s600 and cl600
If the smoke is coming from under the hood, then it could be possible that the valve cover gasket isn't seated properly and it's pissing out of there. That would explain the high amount of oil being used. It's a super long gasket and pretty easy to have an issue with it due to that.
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