BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing
 
European Auto Source (EAS)
Post Reply
 
Thread Tools Search this Thread
      08-13-2020, 03:43 PM   #1
Matthew III
Smooth Operator
Matthew III's Avatar
United_States
23
Rep
66
Posts

Drives: 2008 E92 M3
Join Date: Feb 2020
Location: San Francisco

iTrader: (0)

Garage List
2008 BMW M3  [0.00]
Differential Whine: Fluid or Bearings?

Hey guys, I believe I have a whine from my differential and the recording is here. Any help to identify the root cause is appreciated.

The prior owner claimed to have changed the diff fluid 15K miles ago and upon inspection the diff fluid was dark so that's not a good sign. Thanks!

Appreciate 0
      08-13-2020, 07:22 PM   #2
Redd
Lieutenant Colonel
969
Rep
1,850
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

That's not diff whine. That squeak is probably diff bearings.
Appreciate 0
      08-13-2020, 10:47 PM   #3
Matthew III
Smooth Operator
Matthew III's Avatar
United_States
23
Rep
66
Posts

Drives: 2008 E92 M3
Join Date: Feb 2020
Location: San Francisco

iTrader: (0)

Garage List
2008 BMW M3  [0.00]
Quote:
Originally Posted by Redd View Post
That's not diff whine. That squeak is probably diff bearings.
ignore the chirping, that was from a clunky exhaust install. it's fixed now, but my concern is the whine you hear in background
Appreciate 0
      08-14-2020, 12:32 PM   #4
Richbot
Major General
2124
Rep
5,268
Posts

Drives: Jerez Black E90
Join Date: Sep 2007
Location: STL

iTrader: (5)

That's how my car has sounded since it was new at certain speeds like 40-50mph, especially on coast-down it's always had a little bit of gear whine.

It has 129,000 miles on it now and the diff has never had any problems. The fluid being brown after 15k is normal.
__________________
Appreciate 1
      08-14-2020, 12:37 PM   #5
Matthew III
Smooth Operator
Matthew III's Avatar
United_States
23
Rep
66
Posts

Drives: 2008 E92 M3
Join Date: Feb 2020
Location: San Francisco

iTrader: (0)

Garage List
2008 BMW M3  [0.00]
Quote:
Originally Posted by Richbot View Post
That's how my car has sounded since it was new at certain speeds like 40-50mph, especially on coast-down it's always had a little bit of gear whine.

It has 129,000 miles on it now and the diff has never had any problems. The fluid being brown after 15k is normal.
omg this is normal? fuck
Appreciate 0
      08-14-2020, 04:53 PM   #6
akkando
Major General
3824
Rep
5,062
Posts

Drives: 17 M2 DCT LBB,11 e90 M3 ZCP IB
Join Date: Jan 2017
Location: Bay Area

iTrader: (1)

Quote:
Originally Posted by MattyRice View Post
Quote:
Originally Posted by Richbot View Post
That's how my car has sounded since it was new at certain speeds like 40-50mph, especially on coast-down it's always had a little bit of gear whine.

It has 129,000 miles on it now and the diff has never had any problems. The fluid being brown after 15k is normal.
omg this is normal? fuck
did the previous owner install stiffer diff bushings than stock? you could try fluid change with the additive I'm it that reduces differential chatter. think BMW makes one with SAF-XJ + FM booster but do your own research to make sure you get the right one.
Appreciate 1
      08-14-2020, 07:21 PM   #7
Matthew III
Smooth Operator
Matthew III's Avatar
United_States
23
Rep
66
Posts

Drives: 2008 E92 M3
Join Date: Feb 2020
Location: San Francisco

iTrader: (0)

Garage List
2008 BMW M3  [0.00]
Quote:
Originally Posted by akkando View Post
did the previous owner install stiffer diff bushings than stock? you could try fluid change with the additive I'm it that reduces differential chatter. think BMW makes one with SAF-XJ + FM booster but do your own research to make sure you get the right one.
Completely stock. Yeah waiting for the fluid to arrive. Hopefully that solves it. I'm concerned if it's an issue with the gears
Appreciate 0
      08-14-2020, 09:07 PM   #8
Redd
Lieutenant Colonel
969
Rep
1,850
Posts

Drives: 2010 BMW E92 M3 Dakar Edition
Join Date: Jul 2015
Location: Malaysia

iTrader: (0)

Ok I hear it. There is a little bit of diff whine. Check the bushings and see if they were upgraded. Stiffer bushings will cause whine. I would also change the fluid to original fluid and see if that helps.
Appreciate 1
      08-17-2020, 02:43 PM   #9
Matthew III
Smooth Operator
Matthew III's Avatar
United_States
23
Rep
66
Posts

Drives: 2008 E92 M3
Join Date: Feb 2020
Location: San Francisco

iTrader: (0)

Garage List
2008 BMW M3  [0.00]
Update, had another person help me on a separate thread. Need to replace the diff...
Appreciate 0
      10-12-2020, 10:57 PM   #10
kyrix1st
Major
kyrix1st's Avatar
Japan
1224
Rep
1,336
Posts

Drives: E36 M3 Euro, E36/7, E92 M3
Join Date: Sep 2014
Location: Kyoto

iTrader: (0)

Garage List
2004 BMW Z4  [0.00]
Try flushing with motul competition 75w-140 2-3 times every 1000-2000 miles. Mine is dead quiet and locks really well after that.
__________________
Pass me if you can.
Appreciate 0
      10-14-2020, 03:29 AM   #11
testdriver
Private First Class
Hong Kong
22
Rep
135
Posts

Drives: E92 M3 6spd
Join Date: Jan 2012
Location: HK

iTrader: (0)

I replace my LSD bearing in last Sept..... the whining noise from a bad bearing is much much much louder than yours. It was so loud that you can't even chat or listen to radio.
__________________
E92 6spd, Endless 6POT w/ MX72Plus, W003 & ME22. KW Clubsport 3 way, Akra Evo, Rays ZE40 w/ RE71R, BPM tune
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:09 AM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST