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Small Oil Leak, Any Ideas

 
Old 02-28-2017, 12:09 PM
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Small Oil Leak, Any Ideas

I have searched and found two similar threads to mine with the leak in this area (one with no outcome and the other was an failed engine mount)

Towards the end of last year I noticed after motorway (highway driving) the next day in the garage there would be a small patch on the garage floor (At first I thought this may have been overspill from a recent service), I dont do many highway driving so it was a while again before I did and noticed it again a couple of months after the service so booked the car in (which it was November/December). They had the car in and noticed spill on the undertray too and said I had a leak and they needed to find it. They called me to say it was the engine oil pan gasket and replaced. I have not done much highway driving since but there were no marks on the garage floor so thought all was well until today! the car was on the ramps and he let me stand under the car when I noticed two separate dark stains on the undertray on the front left passenger side in UK) near the primary cat. I got a torch to look around and there was what looked like fresh oil on the topside of the engine oil pan and around the lip so something higher up had come down onto it, I looked further up and the only thing I could see was fresh oil on a screw on the engine side of where the bell housing for the gearbox screws into.

So from the above it looks like the leak is higher than the engine pan.

Any ideas guys please? Much appreciated

Last edited by Phil_T; 07-12-2019 at 09:17 AM.
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Old 02-28-2017, 12:31 PM
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Centrifuge cover

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Old 02-28-2017, 01:08 PM
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Maybe leaking from the PCV? I have a small leak as well. Coming from up higher and dripping down.

Also, UK driver side is front right (why they call it RHD). Left and Right designation is determined while you're sitting in the car looking out the front windshield.
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Old 02-28-2017, 01:57 PM
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Originally Posted by Jasonoff View Post
Maybe leaking from the PCV? I have a small leak as well. Coming from up higher and dripping down.

Also, UK driver side is front right (why they call it RHD). Left and Right designation is determined while you're sitting in the car looking out the front windshield.
Thanks for the suggestion I will try to take another look but shining the torch down there I couldnt see much. Does yours leak down onto the lip of the engine on pan? There isnt much oil but some is new/old.

Yes fixed its passenger side which is front left. (Car is RHD)
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Old 02-28-2017, 02:14 PM
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try to take pics when you can so members can have a visual and give better advice.
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Old 02-28-2017, 02:31 PM
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The screw with oil was around this area, then oil on the pan lip below and the undertray.

It was all over the side and lip of the pan circled below.


Last edited by Phil_T; 02-28-2017 at 02:33 PM.
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Old 02-28-2017, 02:41 PM
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Down the right side for me just ahead of the steering rack behind the front swaybar.
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Old 02-28-2017, 03:53 PM
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Originally Posted by Jasonoff View Post
Down the right side for me just ahead of the steering rack behind the front swaybar.
I would have thought that is too far forward for pcv? PCV is right at the back of the intake manifold?
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Old 02-28-2017, 04:07 PM
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There's lots of channels it could take on the way down though.
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Old 02-28-2017, 04:12 PM
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Hey Phil, it's possible that it's your valve cover. My passenger side one leaked last year. I took it off and retorqued the bolts, but that didn't solve it. Eventually I got the time to tackle it again in December (ahem I picked a freezing cold saturday to do it!) and I used a new oem gasket....all is well now. I think they're around....£15 each....? maybe £12. I really can't remember tbh. It's doable at home on the driveway, but just a bit of a PITA because the lower bolts are really tricky to access and the wiring loom makes it very tight to remove/refit the cover.
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Old 02-28-2017, 04:21 PM
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When I did my HBs the VC gasket was pretty nasty.
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Old 02-28-2017, 11:34 PM
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Depending on the mileage of your car it is probably the VC gasket. I have 110k miles and mine need replacing.

I already have them, just haven't got around to them yet.
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Old 03-01-2017, 05:43 AM
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Originally Posted by Celicasaur View Post
Hey Phil, it's possible that it's your valve cover. My passenger side one leaked last year. I took it off and retorqued the bolts, but that didn't solve it. Eventually I got the time to tackle it again in December (ahem I picked a freezing cold saturday to do it!) and I used a new oem gasket....all is well now. I think they're around....£15 each....? maybe £12. I really can't remember tbh. It's doable at home on the driveway, but just a bit of a PITA because the lower bolts are really tricky to access and the wiring loom makes it very tight to remove/refit the cover.
Thanks for the suggestion I will mention this when it goes into the shop in 4 weeks as not much mechanically I would want to tackle on the car and it has extended warrenty so may aswell use it.

Originally Posted by Jasonoff View Post
When I did my HBs the VC gasket was pretty nasty.
What does HB and VC stand for?

Originally Posted by QWKSNKE View Post
Depending on the mileage of your car it is probably the VC gasket. I have 110k miles and mine need replacing.

I already have them, just haven't got around to them yet.
The car only has 24,000 miles on which I have put on from new, as above what does VC stand for?
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Old 03-01-2017, 05:50 AM
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Fair play, buddy, it shouldn't be a big thing/cost for the workshop to sort out.

HBs I'm guessing Jason means Head Bolts
VC == Valve Cover a.k.a. Rocker Cover
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Old 03-01-2017, 07:52 AM
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Originally Posted by Celicasaur View Post
Fair play, buddy, it shouldn't be a big thing/cost for the workshop to sort out.

HBs I'm guessing Jason means Head Bolts
VC == Valve Cover a.k.a. Rocker Cover
Thanks, yes its just ashame they had it in for a leak in the same area and because it was a gasket I had to pay for that and labour as gaskets are not covered under extended warrenty so I paid like $500 for nothing. As with merc extended warrenty you can only take it to Mercedes and you have to authorise X amount of hours investigating and if its something like a seal or gasket you have to pay for that plus the investigating and labour.

Last edited by Phil_T; 03-01-2017 at 01:54 PM.
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Old 03-01-2017, 11:30 AM
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Originally Posted by Phil_T View Post
Thanks for the suggestion I will mention this when it goes into the shop in 4 weeks as not much mechanically I would want to tackle on the car and it has extended warrenty so may aswell use it.



What does HB and VC stand for?



The car only has 24,000 miles on which I have put on from new, as above what does VC stand for?
Head bolts and Valve Cover
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Old 07-24-2018, 09:27 AM
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So after last time I took it back to Mercedes and they said its not leaking any more, The car is a second car has has only been out a few times. It was back at Mercedes yesterday for a service which they reported small oil leak! Hahaha I rung up and told them how long this has gone on for and how much I have spent with them telling me it was one thing then paying for diagnosing others so I want them to fix it but I aint paying for any further investigation. The guy was pretty understanding on the phone and asked if they could keep the car for the week to investigate and he agreed its not good its gone on for two years and ive paid money for wrong diagnostic and further charges to find the leak previously. Hopefully they will find it this time! I have even given them a few pointers from similar problems and suggestions from you guys eg pcv, valve cover, intake gasket.

I noticed last week too I could smell abit of oil burning which I have not smelled before and it was also the 2nd or 3rd time the oil cap and valve cover top around it had oil stains after cleaning it previously.
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Old 07-24-2018, 09:59 AM
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I will leave this here, I hope this is not the case for you, but you mentioned leaking from the mount area.

https://mbworld.org/forums/c63-amg-w...mon-issue.html
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Old 07-27-2018, 04:46 AM
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Just found out they pretty much think its the upper pan, they are checking with extended warranty now to see if its covered.
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Old 07-27-2018, 05:45 AM
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Fingers crossed for you bud.
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Old 07-27-2018, 08:08 AM
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Well on the phone Mercedes dealer said they didn’t know if its the pan or the seal of the upper pan, they have obviously gone to Mercedes extended warranty and told them this or that it was the seal which the dealership has now come back to me saying that the extended warranty wouldn’t cover it but they would do it as a good will and pay towards the cost, but I declined because I should not pay anything because of what I have previously said in this thread.

1. This oil leak appeared after the 3rd year service on the gearbox which the leak is in that area.

2. I came back to them with this problem after the 3rd service stating there is now an oil leak after the service as it was on my garage floor! The car at this time still have 2 weeks left of the 3 years manufacturing warranty.

3. At the time of point 2 they could not get car booked in before the 2 weeks but I bought Mercedes extended warranty. I stated this happened as above and was the dealers fault as the leak is also in the same area worked on but the dealer said the leak was coming from an area that was not worked on (They described at the time in person where leak was and that it was not covered by extended warranty because it was a seal)

I therefore paid £350-£450 including oil to fix what they said was the problem

4. I returned to Mercedes at a later date of using the car only a few times over serveral months that there was oil on my garage floor again, I paid £100 diagnostics for them to tell me they cant see where the oil is coming from, We have cleaned it off so come back after 1000miles (I explained this is a second car so will take a while)

5. I went back after 700 miles over the course of several months, paid £100 diagnostics again for them to say we cant see where it is coming from and you still have 300 miles left to do. I asked them what they will do next and they said they will need more diagnostics at £100 x hours they need to find. They also said if they find it to be coming from a certain area they cant reach that would be engine out job at £100 x 10 hours!!!! So I went away and drove the car another 300 miles.

5. A few months go by I have the car up on some ramps at a garage which I saw all the oil again so cleaned it all off, booked the car into Mercedes while driving the car a few days

6. Finally the car went back into Mercedes and all they said was there was no more oil leak!!

7. A few months go by with the car being driven 4 short times, It went in for its service this Monday which they said you have an oil leak (No ****) So I explained everything above.

There is no way I should pay for anything, this happened after the 3rd year gearbox service with the leak around that area so something has obviously happened. I have paid for one so called fix plus two lots of diagnostics.

I have also found 10 examples on UK forums alone with some more on this forum stating they have a gearbox oil leak in the same area, same car and after 3rd year geabox service!!! Coincidence???? I think so!!

Last edited by Phil_T; 07-27-2018 at 08:13 AM.
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Old 08-03-2018, 04:58 PM
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Oil leaking from block/trans area
I have a leak from above the rear of the pan, between the engine block and trans. Would this possibly be the PCV leakage draining down? Theres a rather large amount dripping, my splash pan was full and spilling out.
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Old 08-09-2018, 02:18 AM
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Update

I went to pick up the car yesterday but have to leave it with them again because fixing a seal to do with the aircon has now made a hissing noise and intermittent rattling when the fans inside are blowing or if the ac is on.

In regards to the rest of the oil problem they have done the upper pan seal which I had to contribute to but at their cost they have done the lower pan seal again and done the gearbox rear main seal because it had to be pulled to do the upper pan. They also noticed while working on the car the drivers side engine mount was slightly leaking (not same side oil leak was from) so they replaced the drivers side engine mount (explains why I could probably feel a slight vibration through the car and when my leg was against the tunnel)

So hopefully the oil leak is fixed but time will tell, I just hope they can fix the ac problem. At a guess from reading other posts its eitheir ac regass, condensor or something else?
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Old 07-12-2019, 08:51 AM
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So still not fixed, I honestly don’t believe this!!

After the service last year I took their word for it that it was fixed (upper pan leak) and put the car away for 11 months under the cover and on the trickle charger. (Had health issues which is why car was garaged)

The service is due next week so took the car out for a run and the gearbox isn’t shifting right almost like its slipping, in comfort the changes are not smooth up or down and on two occasions it has changed from 3rd to 2nd that harsh it was like the car had been rear ended!

I heard the manager was leaving before my upcoming service so I rung Mercedes HQ for them to get in writing what he told me last year “if for some reason there is still an oil leak we will fix this free of charge due to misdiagnosing wrongly twice previously” Mercedes Hq also spoke to him to say that I am having gearbox issues since the upper pan leak “fix” that they also replaced the rear main seal at the same time.

The manger has turned round to Mercedes HQ and said he never told me they would fix it for free if there was still an oil leak, he also said they never pulled the gearbox away from the engine!!!

Wow I honestly don’t believe he has lied about all this, As last year they also said they fixed the upper pan leak by resealing without pulling the engine!

This cannot even be done! Also how do you replace a rear main seal without removing the gearbox? Luckly I have paperwork that says they did the rear main seal!

This morning I have taken it to a garage for inspection and guess what!! Still leaking from upper pan and now leaking from gearbox bellhousing between the engine after they pulled the gearbox!!! No wonder it’s shifting weired.












Last edited by Phil_T; 07-12-2019 at 09:12 AM.
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Old 07-13-2019, 11:02 AM
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So a few questions guys,

- Firstly should that lower engine oil pan be sealed with selant? I am sure it was a gasket and previously I couldn’t see no sealent round there at all.

- Am I right in thinking if there is a problem with the rear main seal which they changed and also because the new 2nd oil leak they have caused means engine oil is getting into the gearbox and onto the flywheel? Which would also explain the slipping and jerky gearchanges.

- You cannot do an upper pan job without removing the engine? If you look it some of the pictures there is loads of black sealent on the block like its been done on the outside
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