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  #1  
Old 03-14-2013, 10:32 PM
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1999 e300 oil leak

my car has an oil leak that is driving me crazy

we cannot see where it is coming from

today we were working on a water system gasket that is to the right of the water pump and we have a lot of the stuff out of the way and still cannot see where it is

must be low on the engine and now we can see it is definitely coming from somewhere low on the passenger side area, that is where the most oil is
but we cannot see it from underneath

the 2 trans lines right there have a good bit of oil on them and that large hose underneath/next to them but it is not trans fluid, definitely oil

mech is thinking possibly blow off oil-not sure that is the right term??

i do have the egr delete mod and i read on some of the 06 cdi stuff some of them were possibly having blow off oil with their egr delete mods

anyway it is not like i have to add much oil often but i hate a messy motor and would like to solve this problem if possible

any ideas would be greatly appreciated

thank you
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  #2  
Old 03-14-2013, 10:50 PM
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Exclamation Follow the oil from gravity.....

Post up several pictures, and let's see where the oil leads us to?

I am assuming your '99 E300 still has it's (3) diaper panels - side-to-side / front-back (green panels) underneath the radiator/engine back to the transmission? If your '99 has these panels - far less air-flow at speed will be pushing oil back across surfaces.
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Old 03-15-2013, 12:09 AM
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i think i should get to the shop tomorrow before much stuff gets put in and i will try and get pics

i do not have any of the anti noise pan things, that is the next project, would be nice to get this oil leak solved before i put those on and get them messy

this does not seem to blow back a whole lot, at least from what i have seen, seems it is to the front of the engine more, but i will look under there better tomorrow
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Old 03-15-2013, 03:03 AM
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If it's in the shop and on a lift, your mechanic will be doing the tracing / sourcing of the liquid (oil?) anyway. Don't assume the worst at this time....
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Old 03-15-2013, 03:14 AM
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we have been looking each time it is on the lift for something else and we cannot see where it is coming from, either from the top or bottom

it has not been the main focus whenever we have been working on it but we have been looking

i will clean the engine again and start climbing under it and look for the top and see if i can narrow down the area

it is not a big leak, very small actually but i just dont like the dirty engine

hmm i was not thinking it was a big deal, just a small seal somewhere, is there a particular seal i should be concerned with that is not going to be good?
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Old 03-15-2013, 03:30 AM
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There's a lot of stuff right there at the front under the engine, between the radiator and the front of the engine on a '99 E300 - you've got the cross-pipe intercooler tube for the turbo shooting compressed air over to the intake on the left upper side of the engine. So, there's a lot of peeking and perhaps a mirror and holding of a flourescent trouble light to contend with too, to see anything down there. It's tight-quarters for sure on our car's front engine cavities.

Might be something - or might be nothing.......

My '99 E300's turbo sprung an oil leak, thereby filling the intercooler tube with engine crankcase oil when I was on the road working down in South Louisiana the year after buying the car new. It was still under warranty and spent two weeks at the Mercedes-Benz dealer in Baton Rouge, LA. waiting for a new turbo from MB. In that episode my car's diaper/green panels were drenched with oil, and warranty bought me new ones the dealer replaced at that time too.

The underside panels aren't necessary to have on the car, but they sure let the engine cavity on the lower-end stay very pretty and clean. This is the cleanest car I've ever owned and able to keep it pretty and clean top to bottom, and front to back. It's been 3+ years since I've had the panels off to perform an oil change on the car, (don't hardly drive the car at all for 10 years+) and it's about due, 10K miles on the Mobil 1, so I'll look around to see if I have anything like oil down there. Hope not.
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Old 03-15-2013, 06:19 AM
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On my car, the joint between the up pipe and the intake manifold leaks a little and it sprays the blow by oil all over the place. This is enough to make it look like it has another more conventional leak.

I'd guess it drips about 5 drops or so every time I park.
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Old 03-15-2013, 09:41 AM
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Mine has a seep near the exhaust manifold. It's a slow leak and likely a blow-by leak. It also winds up in the tube going to the intake manifold.

Hope you find your leak.
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Old 03-15-2013, 11:23 PM
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ahhhhh, i think i found it !!!!

i took some pics this morn but have not had time to load them on the ipad

anyway we got done at the shop and i took it over and washed the engine again , so i have driven about 15miles and i just got under it

the big hose on the bottom right front of the motor , next to the 2 small trans lines has a hole in it, and i think it is coming from there

what is the name of that big hose?
and i guess i should ask if that hose should have oil inside it?
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Old 03-16-2013, 01:02 AM
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Quote:
Originally Posted by courtney View Post
ahhhhh, i think i found it !!!!

i took some pics this morn but have not had time to load them on the ipad

anyway we got done at the shop and i took it over and washed the engine again , so i have driven about 15miles and i just got under it

the big hose on the bottom right front of the motor , next to the 2 small trans lines has a hole in it, and i think it is coming from there

what is the name of that big hose?
and i guess i should ask if that hose should have oil inside it?
I would guess it's part of the intercooler tube that feeds the turbo-boosted air to the intake manifold. It could be your turbo is leaking crankcase oil from the engine - is my first suspicion. -Just like mine did when the turbo manfunctioned. If it's the turbo, I am going from a long time ago, but I am thinking it was about a $2K +/- MB repair, (IIRC.) Who sez these newish turbodiesels are cheap to fix/repair in parts. Check it out with your mechanic.
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Old 03-16-2013, 01:52 AM
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well blah, i was excited i found the leak, but not so much now

so there should be no oil in it at all? not even a little bit of blowby oil or whatever they call it?

i just drove it about 125 miles and rechecked down there and i am now sure that is where it is coming from, but there is hardly anything there right now

and i dont have to put any oil in between oil changes, or maybe 1/4 quart - but i change closer to 8000

i will go over it with him and see what he says

i have an ex that might be able to rebuild it if it is really 2 grand

maybe i should try to pick up a used one from someone or the junkyard just to have it in case it goes out on a trip
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Old 03-16-2013, 09:38 AM
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1999 e300 oil leak

Quote:
Originally Posted by Skid Row Joe View Post
I would guess it's part of the intercooler tube that feeds the turbo-boosted air to the intake manifold. It could be your turbo is leaking crankcase oil from the engine - is my first suspicion. -Just like mine did when the turbo manfunctioned. If it's the turbo, I am going from a long time ago, but I am thinking it was about a $2K +/- MB repair, (IIRC.) Who sez these newish turbodiesels are cheap to fix/repair in parts. Check it out with your mechanic.
Hey Joe,

Do you remember if it was just turbo seals or what? One of my coworkers did the R&R on his turbo seals and all it cost was the removal time and the cost of the seals (under $100 IIRC). Although his car was a W124, I suspect that the W210 w/OM606 would be much easier. The turbo is much easier to remove from these newer cars.

I ask, because I have oil in the air inlet tube that connects to the intake manifold.
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Old 03-16-2013, 12:56 PM
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Quote:
Originally Posted by anghrist View Post
Hey Joe,

Do you remember if it was just turbo seals or what? One of my coworkers did the R&R on his turbo seals and all it cost was the removal time and the cost of the seals (under $100 IIRC). Although his car was a W124, I suspect that the W210 w/OM606 would be much easier. The turbo is much easier to remove from these newer cars.

I ask, because I have oil in the air inlet tube that connects to the intake manifold.
It was R & Red under factory warranty at the MB dealer in Baton Rouge, LA. at the time. The dealership replaced the whole turbo, and I got a fresh crankcase fill of oil too at the time. Whether it was a simpler fix, and the dealer just went for the jugular with MBUSA reimbursing them, I haven't a clue. I have long suspected that dealers overkill on parts and procedures, that may or may not be valid to change out in the first place. When I picked up the car, I asked the service advisor what the fix would have cost not under warranty, which he replied; "$2K," if I am recalling correctly. I know it was up there.
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Old 03-16-2013, 01:10 PM
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ok, i think i should do some research on r and r for the turbo and be prepared to have that fixed in the future

will see what my mechanic says on this and if he knows someone who can rebuild it
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Old 03-16-2013, 01:30 PM
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Quote:
Originally Posted by courtney View Post
will see what my mechanic says...
x2 on that. This approach tends to save you money.

I know that I've been operating this way (oil seepage & in the air pipe) for 6+ years now. I don't think that it is all that critical. It just costs an extra quart of oil every 8-10k miles.
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