Super small oil leak, can anyone tell me what this part is?

Ahanix · 03-17-2019, 05:41 PM

I purchased my 340ix CPO about a month ago and I started noticing a bit of oil (maybe a dime worth) on my floor of my garage the last two nights. Got under the car today and noticed the following.

Can anyone tell me what part this appears to be? Just want to have a clue before I talk to a service advisor tomorrow.

sspade · 03-17-2019, 06:00 PM

Looks like the transfer case to me...

sspade · 03-17-2019, 06:01 PM

^ there is a drain plug visible and an axle sticking out of it...

You are also xDrive.

Its definitely your transfer case leaking.

Ahanix · 03-17-2019, 10:02 PM

Quote:

Originally Posted by sspade

^ there is a drain plug visible and an axle sticking out of it...

You are also xDrive.

Its definitely your transfer case leaking.

Thanks!

JimKden · 03-18-2019, 08:29 AM

It' engine oil. Gear case oil is almost clear in color.

obert · 03-18-2019, 08:36 AM

Curious to know what’s leaking. OP you don’t see a leak from up top anywhere? To have it dripping like that means it’s leaking a lot.

Ahanix · 03-18-2019, 10:20 AM

Quote:

Originally Posted by obert

Curious to know what’s leaking. OP you don’t see a leak from up top anywhere? To have it dripping like that means it’s leaking a lot.

No other leaking present, if you look at the bolt from those angles you can see it appears to be leaking out of that lower area, almost like the bolt isn't tight enough. I'll be taking it in tomorrow and will keep you posted.

obert · 03-18-2019, 10:29 AM

Quote:

Originally Posted by Ahanix

No other leaking present, if you look at the bolt from those angles you can see it appears to be leaking out of that lower area, almost like the bolt isn't tight enough. I'll be taking it in tomorrow and will keep you posted.

CPO is a good thing for stuff like this

Just had a oil leak fixed under CPO.

sspade · 03-18-2019, 10:42 AM

Quote:

Originally Posted by JimKden

It' engine oil. Gear case oil is almost clear in color.

I do agree, looks a bit dark for gear oil but it does appear to be coming directly out of the transfer case (third pic).

Then again, when I replaced the gear oil in my rear differential last month - it was BLACK... not clear like when it goes in fresh.

Interested to hear what the dealer tells OP.

Ahanix · 03-18-2019, 12:42 PM

Quote:

Originally Posted by sspade

I do agree, looks a bit dark for gear oil but it does appear to be coming directly out of the transfer case (third pic).

Then again, when I replaced the gear oil in my rear differential last month - it was BLACK... not clear like when it goes in fresh.

Interested to hear what the dealer tells OP.

Thanks for the info, this has been really helpful! Trying to get all of this squared away before Bootmod3 for B58 is released.

Ahanix · 03-19-2019, 11:26 AM

Figured I would update this thread. Service found a leak on the turbo oil return line and are ordering it in and fixing it tomorrow. Was just a coincidence that it was dripping down on the transfer case.

doodlebro · 03-19-2019, 02:02 PM

Are they replacing the turbo as well? A leaking return line points to issues with the turbo and getting old oil out/new oil in. I'd be a pest about it and make sure the return line was physically broken and not leaking from where it connects to the turbo.

Ahanix · 03-19-2019, 02:16 PM

Quote:

Originally Posted by doodlebro

Are they replacing the turbo as well? A leaking return line points to issues with the turbo and getting old oil out/new oil in. I'd be a pest about it and make sure the return line was physically broken and not leaking from where it connects to the turbo.

They sent me back with the car today while they overnight the return line, they didn't seem to have any concern since the line has a very small leak from the oil pan side rather than the turbo.

They were just going to replace the o-rings, but the technician came back and said the line should be replaced as a precaution (I am assuming based on this comment that it is broken)

Thanks for the heads up, I am going to push on them about the Turbo. I don't really need a failed turbo / reason to get a Pure Turbo any time soon, especially when I'm still under warranty.

Elipiz23 · 02-08-2023, 07:43 AM

OP I know it’s been a while but any update on the repair? How’s it holding up? Recently had an oil leak as well and your post was identical to the leak I have. Going into service today

danneha · 04-10-2023, 05:28 AM

Have almost the exact same leaking. Oil adds up under the front diff after a coupel of days.

2019 340i with only 30000 miles.

Taking it to service tomorrow.

danneha · 04-10-2023, 05:29 AM

Quote:

Originally Posted by Elipiz23

OP I know it’s been a while but any update on the repair? How’s it holding up? Recently had an oil leak as well and your post was identical to the leak I have. Going into service today

Did they find anything?

03-17-2019, 05:41 PM	#1
Ahanix Second Lieutenant 135 Rep 234 Posts Drives: 2016 340i Join Date: Dec 2018 Location: Utah, United States iTrader: (0)	Super small oil leak, can anyone tell me what this part is? I purchased my 340ix CPO about a month ago and I started noticing a bit of oil (maybe a dime worth) on my floor of my garage the last two nights. Got under the car today and noticed the following. Can anyone tell me what part this appears to be? Just want to have a clue before I talk to a service advisor tomorrow. Last edited by Ahanix; 03-17-2019 at 05:47 PM..
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03-17-2019, 06:00 PM	#2
sspade Major General 2465 Rep 5,457 Posts Drives: F30 Join Date: Oct 2017 Location: Stevenson, WA iTrader: (3) Garage List 2016 BMW 320i [7.87] 2014 BMW 328i [6.83]	Looks like the transfer case to me...
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03-17-2019, 06:01 PM	#3
sspade Major General 2465 Rep 5,457 Posts Drives: F30 Join Date: Oct 2017 Location: Stevenson, WA iTrader: (3) Garage List 2016 BMW 320i [7.87] 2014 BMW 328i [6.83]	^ there is a drain plug visible and an axle sticking out of it... You are also xDrive. Its definitely your transfer case leaking.
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03-18-2019, 08:29 AM	#5
JimKden Private 18 Rep 80 Posts Drives: 2016 340xi Join Date: Jul 2018 Location: Denver iTrader: (0)	It' engine oil. Gear case oil is almost clear in color.
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03-18-2019, 08:36 AM	#6
obert Brigadier General 1781 Rep 4,456 Posts Drives: 2013 328i Join Date: Oct 2011 Location: Seattle Wa iTrader: (49)	Curious to know what’s leaking. OP you don’t see a leak from up top anywhere? To have it dripping like that means it’s leaking a lot.
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03-19-2019, 11:26 AM	#11
Ahanix Second Lieutenant 135 Rep 234 Posts Drives: 2016 340i Join Date: Dec 2018 Location: Utah, United States iTrader: (0)	Figured I would update this thread. Service found a leak on the turbo oil return line and are ordering it in and fixing it tomorrow. Was just a coincidence that it was dripping down on the transfer case. Last edited by Ahanix; 03-19-2019 at 12:21 PM..
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03-19-2019, 02:02 PM	#12
doodlebro Lieutenant 121 Rep 470 Posts Drives: '17 X3 35i Join Date: Mar 2017 Location: Denver iTrader: (1)	Are they replacing the turbo as well? A leaking return line points to issues with the turbo and getting old oil out/new oil in. I'd be a pest about it and make sure the return line was physically broken and not leaking from where it connects to the turbo. __________________ Current mods Rockford Fosgate P3 // JBL MS-A5001 // MiniDSP Ultra Racing Strut Brace // AFe Pro Dry S // PS2 // Custom Inlet // DV+ // FTP Boost Pipes // VRSF Race IC // VRSF Downpipe // ECUTek Protune @ 5280'
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02-08-2023, 07:43 AM	#14
Elipiz23 Registered 0 Rep 1 Posts Drives: Bmw 3 series 335I x drive F30 Join Date: Jan 2023 Location: Denver CO iTrader: (0)	OP I know it’s been a while but any update on the repair? How’s it holding up? Recently had an oil leak as well and your post was identical to the leak I have. Going into service today
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04-10-2023, 05:28 AM	#15
danneha Registered 0 Rep 2 Posts Drives: 340i Join Date: Apr 2023 Location: sweden iTrader: (0)	Have almost the exact same leaking. Oil adds up under the front diff after a coupel of days. 2019 340i with only 30000 miles. Taking it to service tomorrow. Attached Images Last edited by danneha; 04-10-2023 at 05:52 AM..
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