ML320 Bluetec Oil leak - Mercedes-Benz Forum
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#1 (permalink) Old 02-19-2013, 07:34 AM
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ML320 Bluetec Oil leak

I have a ML320 2009 bluetec with 230000 km, and recently I have noticed a oil leak. The oil drips overnight parking from the passenger side in the middle where the plastic undercover is. It has stained the driveway after some time.

It is winter and I am waiting for the climate to warm up for a check from underneath. Between oil changes (10K km) I have added 1 liter of oil.

Has anyone seen this issue and where could the oil be leaking from.
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#2 (permalink) Old 02-19-2013, 08:24 AM
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There are MANY places for the diesel engine to leak oil as well as the steering rack. The engine commonly leaks from on top of the engine, the crankcase breather/blow by hose to turbo inlet hose, the oil cooler (big job), it is very difficult to clean it properly and find the source, I have witnessed it first hand on my own were they claim rear main seal and oil pan but neither were leaking in the end after properly cleaning and waiting. There is a wierd drain chanel of some sort that lets the oil off the intake valley area and down the back of the engine via the bellhousing area, so it always looks like a rear main seal and make a huge mess back there coats the transmission, exhaust, driveshaft etc. For sure the turbo intake seal/blow by hose is a common problem that keeps coming back, the oil cooler I have not tackled yet but hear it is a real big job (10+ HOURS) and not for newbies. Of course there could be other leaks too, but this my experience with these engines and usually long before 230kms, more at 100-150kms they start leaking.
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#3 (permalink) Old 02-19-2013, 12:15 PM
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When I last changed my air filters 2 months back a saw a lot of oil in the turbo inlet. Cleaned everything around including the red gasket which I replaced.

When you say " the crankcase breather/blow by hose to turbo inlet hose" is this at the turbo end or at the engine end, if at the engine end is there a fix for it or you learn to live with it.
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#4 (permalink) Old 02-19-2013, 12:35 PM
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I had the turbo hose leak and it was replaced under warranty and no further leaks.
currently approaching 170K miles and all is well.
The 1 quart of oil "lost" in 10,000 mile oil change cycle could be being used by engine. I have consistently used a half to a full quart of oil between oil changes in my ML CDI.
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#5 (permalink) Old 02-19-2013, 12:47 PM
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sshinde
The crankcase breather hose starts at the pass side valve cover and connects to the "T" shaped duct that connects the air filters. It joins just before the turbo inlet, and there is a small heater inline with an electrical connection.
That is main source of your oil leak and intake manifold issues.
Consider using an air oil separator (Provent 200?) to get the oil out of this tube before it makes it's way to the turbo and
1) leaks out of the broken red seal as it pools by the intake of the turbo or
2) is blown through the airstream and turns to major sludge inside your intake when it hits the EGR tube.
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#6 (permalink) Old 02-19-2013, 01:32 PM
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Like they said, however clean it up and monitor to be sure it is not something more serious like an oil cooler leak.
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#7 (permalink) Old 02-20-2013, 04:11 AM
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Oh lord, I can't stand oil leaks!
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#8 (permalink) Old 03-22-2013, 07:22 AM
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Following all the inputs I repalced both the turboseals (orange ones), the oil is still leaking from underneath, small hadfull puddle everytime the truck is parked in the driveway,

How do you check if the PCV is blocked as mentioned in some replies by digiturbo,

Any other leads to chase,
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#9 (permalink) Old 03-22-2013, 09:15 PM
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Quote:
Originally Posted by houseofdiesel View Post
There are MANY places for the diesel engine to leak oil as well as the steering rack. The engine commonly leaks from on top of the engine, the crankcase breather/blow by hose to turbo inlet hose, the oil cooler (big job), it is very difficult to clean it properly and find the source, I have witnessed it first hand on my own were they claim rear main seal and oil pan but neither were leaking in the end after properly cleaning and waiting. There is a wierd drain chanel of some sort that lets the oil off the intake valley area and down the back of the engine via the bellhousing area, so it always looks like a rear main seal and make a huge mess back there coats the transmission, exhaust, driveshaft etc. For sure the turbo intake seal/blow by hose is a common problem that keeps coming back, the oil cooler I have not tackled yet but hear it is a real big job (10+ HOURS) and not for newbies. Of course there could be other leaks too, but this my experience with these engines and usually long before 230kms, more at 100-150kms they start leaking.
The oil leaks made me give up on my '09 ML320 BT. Oil cooler job is huge and complicated. It happened to me and was botched up twice by the dealer which caused coolant to enter the engine. They were nice enough to allow me a trade-in at retail value.

2011 Mercedes-Benz E350 4Matic Sport [Bought: 12/4/2012]
1998 Mercedes-Benz E320 [Bought: 5/10/2009]
2006 BMW 530xi [Bought: 10/31/2008]

2009 Mercedes-Benz ML-320 Bluetec [Sold: 12/4/2012]
2001 Mercedes-Benz E320 4Matic [Sold: 10/29/2008]
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#10 (permalink) Old 05-16-2013, 01:03 PM
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Hi Everyone, I'm having the same problem. Do you have the part number to the turbo intake seal? The dealer wants 300 to replace it. It seems easy enought that I think i can do it myself.

Thank you
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