Rear Diff Seal Leak?

XxThe_RemedyXx · 07-08-2018, 06:59 PM

I was having my tires rotated and balanced today and noticed oil around drivers side differential. Does this look like a bad seal to you guys?

cfm56d7b · 07-09-2018, 03:56 AM

How many miles does your vehicle have? Did the dealer inspect the differential during the last CBS maintenance?

XxThe_RemedyXx · 07-09-2018, 04:55 AM

Quote:

Originally Posted by cfm56d7b

How many miles does your vehicle have? Did the dealer inspect the differential during the last CBS maintenance?

Currently at 55k. Honestly I'm not sure if they did.

kingmonkey8 · 07-09-2018, 08:20 AM

Quote:

Originally Posted by XxThe_RemedyXx

I was having my tires rotated and balanced today and noticed oil around drivers side differential. Does this look like a bad seal to you guys?

Probably leaking from the output shaft seal. Looks like it has been leaking for a while with the amount of dust on it. But not seeing any drip so might not be too bad.
Check the oil level and top up. Is the diff making any noise?

KGB_123_99 · 07-09-2018, 08:33 AM

I had the same thing on my 2013, see post below.

Dealer had to replace seal and top off oil.

https://f30.bimmerpost.com/forums/sh....php?t=1108145

XxThe_RemedyXx · 07-09-2018, 08:42 AM

Quote:

Originally Posted by kingmonkey8

Quote:

Originally Posted by XxThe_RemedyXx

I was having my tires rotated and balanced today and noticed oil around drivers side differential. Does this look like a bad seal to you guys?

Probably leaking from the output shaft seal. Looks like it has been leaking for a while with the amount of dust on it. But not seeing any drip so might not be too bad.
Check the oil level and top up. Is the diff making any noise?

A few months ago I noticed a high pitched sound when accelerating. Did some research and concluded that the noise may be coming from the diff. I brought it in and they said all was well and couldn't reproduce the sound. I have a feeling this is where the sound is coming from.

XxThe_RemedyXx · 07-09-2018, 08:43 AM

Quote:

Originally Posted by KGB_123_99

I had the same thing on my 2013, see post below.

Dealer had to replace seal and top off oil.

https://f30.bimmerpost.com/forums/sh....php?t=1108145

Awesome. Thanks. Just contacted my SA. Should this be covered under CPO?

KGB_123_99 · 07-09-2018, 08:44 AM

Quote:

Originally Posted by XxThe_RemedyXx

Awesome. Thanks. Just contacted my SA. Should this be covered under CPO?

I don't see why not.

XxThe_RemedyXx · 07-09-2018, 09:57 AM

My SA replied:

"Sorry ... – I got your text and again, this doesn’t bother me at all. I forwarded this picture to my shop foreman. I will see if this is leaking enough to the point of coverage. I cannot make those decisions but it looks like the seal may be “sweating” but I will know for sure shortly."

rak299 · 07-09-2018, 10:32 AM

"Sweating"? Really? I think when some material that is supposed to be kept inside gets outside, it is called leaking.

XxThe_RemedyXx · 07-09-2018, 10:36 AM

Quote:

Originally Posted by rak299

"Sweating"? Really? I think when some material that is supposed to be kept inside gets outside, it is called leaking.

lol, yep! I said "Not sure about sweating, there's oil caked all over". We'll see what they come back with. I don't think this can be classified as "sweating".

vooonoo · 07-09-2018, 11:14 AM

Hope it's covered

I had to post this picture

XxThe_RemedyXx · 07-09-2018, 11:18 AM

Quote:

Originally Posted by vooonoo

Hope it's covered

I had to post this picture

Haha I hope so too...

cfm56d7b · 07-12-2018, 05:50 PM

What is "sweating" as described by the mechanic? Just trying to see some credible insight even if improperly described.

XxThe_RemedyXx · 07-12-2018, 06:39 PM

Quote:

Originally Posted by cfm56d7b

What is "sweating" as described by the mechanic? Just trying to see some credible insight even if improperly described.

Wish I knew. It doesn't even make sense. It's a damn leak, that's all.

XxThe_RemedyXx · 07-16-2018, 02:41 PM

UPDATE - Bad rear axle seal and charge air pressure sensor being replaced under warranty. Copay of $50... I'm happy.

kingmonkey8 · 07-17-2018, 08:55 AM

Quote:

Originally Posted by XxThe_RemedyXx

UPDATE - Bad rear axle seal and charge air pressure sensor being replaced under warranty. Copay of $50... I'm happy.

What's the charge air pressure sensor? Is this anything to do with the diff?

XxThe_RemedyXx · 07-17-2018, 09:07 AM

Quote:

Originally Posted by kingmonkey8

What's the charge air pressure sensor? Is this anything to do with the diff?

No, but I got a DT Malfunction that lead back to a bad MAF sensor...

Sea-Tac · 07-17-2018, 03:02 PM

Quote:

Originally Posted by XxThe_RemedyXx

Awesome. Thanks. Just contacted my SA. Should this be covered under CPO?

I would say it sure as heck should be covered. Good luck.

XxThe_RemedyXx · 07-17-2018, 03:14 PM

Quote:

Originally Posted by Sea-Tac

Quote:

Originally Posted by XxThe_RemedyXx

Awesome. Thanks. Just contacted my SA. Should this be covered under CPO?

I would say it sure as heck should be covered. Good luck.

Just picked it up, $50 CPO copay and out the door.

cfm56d7b · 07-17-2018, 03:30 PM

Quote:

Originally Posted by XxThe_RemedyXx

UPDATE - Bad rear axle seal and charge air pressure sensor being replaced under warranty. Copay of $50... I'm happy.

Much better than "sweating" diagnosis. ;-). Glad to hear that all is well.

Sea-Tac · 07-17-2018, 05:53 PM

Quote:

Originally Posted by XxThe_RemedyXx

Just picked it up, $50 CPO copay and out the door.

Good...rest easy.

07-08-2018, 06:59 PM	#1
XxThe_RemedyXx Colonel 967 Rep 2,653 Posts Drives: 2016 340i xDrive Join Date: Aug 2009 Location: Westchester, NY iTrader: (0)	I was having my tires rotated and balanced today and noticed oil around drivers side differential. Does this look like a bad seal to you guys? Attached Images __________________ 2016 340i xDrive - BM3 Stage 2 93 OTS - xHP Transmission Tune Stage 2 - B58TU HPFP - Bilstein B14 - VRSF Catless DP - Kyostar CAI
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07-09-2018, 03:56 AM	#2
cfm56d7b Lieutenant General 5886 Rep 10,256 Posts Drives: 2017 440i Gran Coupe & 2015 X5 Join Date: Nov 2012 Location: Orange County, CA iTrader: (2)	How many miles does your vehicle have? Did the dealer inspect the differential during the last CBS maintenance?
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07-09-2018, 08:33 AM	#5
KGB_123_99 Captain 404 Rep 962 Posts Drives: '17 330ix M-Sport, '09 528ix Join Date: Apr 2014 Location: Montreal, QC iTrader: (0)	I had the same thing on my 2013, see post below. Dealer had to replace seal and top off oil. https://f30.bimmerpost.com/forums/sh....php?t=1108145
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07-09-2018, 09:57 AM	#9
XxThe_RemedyXx Colonel 967 Rep 2,653 Posts Drives: 2016 340i xDrive Join Date: Aug 2009 Location: Westchester, NY iTrader: (0)	My SA replied: "Sorry ... – I got your text and again, this doesn’t bother me at all. I forwarded this picture to my shop foreman. I will see if this is leaking enough to the point of coverage. I cannot make those decisions but it looks like the seal may be “sweating” but I will know for sure shortly."
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07-09-2018, 10:32 AM	#10
rak299 Major 601 Rep 1,048 Posts Drives: 2021 M3 6MT Join Date: Sep 2016 Location: san francisco iTrader: (0)	"Sweating"? Really? I think when some material that is supposed to be kept inside gets outside, it is called leaking.
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07-09-2018, 11:14 AM	#12
vooonoo ¯\_(ツ)_/¯ 537 Rep 1,000 Posts Drives: f30 328 Join Date: Nov 2017 Location: nj iTrader: (0) Garage List 2014 f30 328i [0.00]	Hope it's covered I had to post this picture Attached Images
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07-12-2018, 05:50 PM	#14
cfm56d7b Lieutenant General 5886 Rep 10,256 Posts Drives: 2017 440i Gran Coupe & 2015 X5 Join Date: Nov 2012 Location: Orange County, CA iTrader: (2)	What is "sweating" as described by the mechanic? Just trying to see some credible insight even if improperly described.
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07-16-2018, 02:41 PM	#16
XxThe_RemedyXx Colonel 967 Rep 2,653 Posts Drives: 2016 340i xDrive Join Date: Aug 2009 Location: Westchester, NY iTrader: (0)	UPDATE - Bad rear axle seal and charge air pressure sensor being replaced under warranty. Copay of $50... I'm happy.
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