DanD.

Hi All,
2014ML blutec 85K on it. Developed some leak pics attached. Taking it to a indi shop for evaluation. But more likely will join the famous club with membership around $3K.

peter2772000

Aw geez Dan. So sorry to read about this. I'm sure this will push you over the edge to get rid of the truck, you were on the fence to begin with.

Can you give me an idea of driving conditions. Where do you live, are you stuck in traffic often etc?

Edit: Not sure, but doesn't the leak manifest itself at the back of the engine at the bell-housing?

DanD.

Hey Peter,
I live near Seattle, WA. My daily commute 32 miles side roads, not so much traffic.
On weekends we do a lot of road trips, averaging 1700 miles per month.

Yes, I'm really considering to ged rid of it, but still thinking. Like the truck, comfort, only one big mistake, should get gas version instead.

Not sure if I should ask MercedesUSA for help, it has 85K miles on it.

peter2772000

I doubt MB will do anything at all, you're way past the warranty. Bring it to an indy and find out where the leak is coming from to begin with. I could swear I read that an oil cooler leak causes oil to drip down the bell-housing, not the front of the engine

johnand

Ouch. I was under the impression the 2014 Bluetec's have the updated Viton seals for the oil cooler that are less prone to leak. Is that not the case? Following, as my 2014 Bluetec has a oil leak I have yet to diagnose.

peter2772000

The updated seals leak as well. Supposedly due to the excessive heat under the hood. From what I've read, the original seals were supple enough for proper sealing but couldn't handle the heat, and the revised versions handle the heat better but don't have the sealing performance.

Screwed if you do, screwed if you don't. I pop the belly pan and engine cover in the summer, hoping that'll help.

DanD.

Some updates, indy shop can't take it till the 26Th. And as Peter mention it should leak towards the back of the engine and trany.
That gave me hope, so I got under the truck.

There was a lot of oil, most of it on the passenger side.
The oil pan looked strange, oil all the bolts
But also around sensor.




At this point I was thinking I need new oil pan gasket and maybe sensor.

Because its so confusing, and it is the lowest point I decided to clean it all and drive.
So, started to clean, from bottom to up.

When I got to the left side, I notice the front of the car has oil all over, so cleaned that, than it was oil on alternator.
Alternator is right above the oil cap, there is a rubber around it, took it off and it has some oil.
At this point I was wow, maybe its just oil can gasket simple as that.
Than I notice oil wet spots on engine cover,



Its definitely signs for excessive pressure, so I had to take air intake off.


It was way more oil that it was last time 15K ago when I took it off to get to the fuel filter.

After cleaning installed the air intake back without connecting bent tube. Started the engine and air does comes from the vent tube so thats ok. Could be faulty valve but because the air with some smog coming out it looks like ok.

So, now. I have it all back, cleaned and going to drive it layer today and inspect tonight.

Thanks for reading this.

peter2772000

I don't understand, where's the oil coming from and why do you have traces of it in the air-intake.

MBenz777

My ML 350 Bluetec has 57,000 miles. I noticed oil leak and I went to dealer and they said is the turbo seal (or something similar related to torbo) leaking.
They replaced that and noticed that was still a leak...so they replaced the oil cooler. Total bill: $4,000...fortunately I've had purchased extended warranty before 50k miles and I didn't have to pay a dime
It looks that this leak is a common problem for diesel Bluetec SUV's.

BTW Speaking of leaking an off topic question: Does anyone know where I can get an oil drain plug gasket for my ML 350 Bluetec, and if is there a MB part number for this tiny little part?

DanD.

I got drain gasket from dealer, two gaskets and one drain plug was about 14$.

Part number 007603-012102

MBenz777

I got yesterday a set of 3 gaskets from O'Reilly Auto Parts for about $4 and I am pretty sure they fit the drain plug.

Thank you for your reply.

MBenz777

I've Google the Part Number and this is what popped up:

Fischer & Plath Metal Seal Ring / Washer; 12x16x1.5mm; Copper
SKU: 007603-012102 $0.26
https://www.autohausaz.com/pn/140397...SABEgKFWvD_BwE

DanD.

I thing I will pass this time joining the club. After cleaning and replacing a few seals, two days not even one drop.
Still unknown where originally oil came from. Because it was on alternator I assumed it came from oil cup.

Bottom engine cover show kind of a lot of it



For now, Im still happy owner of ML.

peter2772000

Awesome bud!!!

Bern6389

DanD.

1. Turbo seal
2. Air Filter seals. Both sides.
3. Breather seal. Left side in air-intake.
4. Oil cap. New
5. Air filters new.

So far so good. Let me know if you have any questions.

Bern6389

MBenz777

Apparently this turbo seal is a common problem, I've heard several people having leaks because of failure of that seal, including my car was having the same problem.

DanD.

This is breather seal, if you have original as mine, cut it by the edge.


Turbo seal

Bern6389

DanD.

Right this way,

DanD.

I really don't think oil came from this seal, when I took it off I didn't see any fresh oil.
This seal was replaced 17K miles ago, when I changed fuel filter. But I can tell seal was very soft compare to the new.

Denysckss

the orange turbo inlet seal should be replaced with oil changes they only about $25 and easy to do.
but if u got oil leak at the bottom it may be oil cooler