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      08-24-2011, 08:55 AM   #1
Michaeljh2000
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Weird Noise

It only happens occasionally, but is now occurring more often. When I make a right hand 90 degree turn in 2nd gear (DCT) and while slightly accelerating, I can hear a low frequency "groan" as if something is rubbing. My car is completely stock. Any ideas?
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      08-24-2011, 09:25 AM   #2
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It's the diff...and it's normal.
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      08-24-2011, 09:54 AM   #3
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Fluid change will clear it up... dealership.
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      08-24-2011, 06:56 PM   #4
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There is a service bulletin on it. You can find it online. Go to the dealer and tell them you need the "Special" differential fluid. Should be a 45 minute job while you wait.
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      08-24-2011, 07:19 PM   #5
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Warranty yes...
dealership, no questions.
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      08-24-2011, 07:20 PM   #6
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Warranty yes...
dealership, no questions.
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      08-25-2011, 05:22 AM   #7
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Just had this service done last week. Problem fixed with no hassle.

This may be the bulletin: SI B33 01 02
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      08-25-2011, 07:36 AM   #8
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Same problem here. Thanks for the info!
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      08-26-2011, 06:42 AM   #9
Michaeljh2000
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Man....you guys are great!
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      08-26-2011, 07:44 AM   #10
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This Service Information bulletin supersedes SI B33 01 02 dated March 2008.

SUBJECT
Grinding Noise from the Differential during Slow Cornering

MODEL
E90, E92 and E93 M3 from start of production

SITUATION
A grinding noise may be heard coming from the differential during slow cornering. This noise is best heard during tight cornering situations; for example, while parallel parking, driving in a tight circle, etc.

CAUSE
When the rear wheel speed differential varies during tight cornering, a slip stick effect is created on the lining and steel discs incorporated in the differential locking clutch, causing the grinding noise. This noise typically goes away as the locking clutch discs in the differential are broken in.
The break-in time varies depending on driving habits; for example, tighter cornering (working the locking clutch) means that it takes less time to break in the locking clutch discs.

CORRECTION
If a customer complaint is verified as described above on the E46 M3; E60 M5; E63 and E64 M6; or on the E90, E92 and E93 M3 vehicles, the differential oil should be replaced with a specially formulated differential oil, BMW part number 83 22 2 282 583.
PROCEDURE
1. Drain the differential oil. Refer to the appropriate model repair instruction in TIS:
Main Group 33 / Subgroup 10 / RA 0011259.
2. Refill the differential with special differential oil as shown in the illustration below.
Differential fill capacity = 1.2 liters (1.3 quarts).
3. Road test the vehicle.
With the vehicle at operating temperature, drive in tight circles (20 circles in each direction), allowing the special oil to coat the locking clutch discs.
The grinding noise will decrease when the locking clutch discs are sufficiently coated. Some slight noises may still be heard after driving in tight circles. Advise the customer that it will be necessary to drive the vehicle up to 600 miles before all noises are eliminated.
Note: Vehicles that have had the differential oil converted to this special oil should continue to use this oil whenever a service requiring the differential oil replacement is indicated.
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      08-26-2011, 01:06 PM   #11
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Wow. There are all kinds of noises with this car I would never aven notice or care about until I read the threads. I just chalk them up as normal unless something stops working. It's like a car form of hypochondria!
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      08-26-2011, 01:39 PM   #12
Michaeljh2000
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Quote:
Originally Posted by immiketoo View Post
Wow. There are all kinds of noises with this car I would never aven notice or care about until I read the threads. I just chalk them up as normal unless something stops working. It's like a car form of hypochondria!
Agreed. I've gotten used to most of the various noises. This one though, from the differential apparently, needs to go. Thankfully, it only happens once in a while. Thanks to the folks on this forum, I was able to find TSB from BMW and will have the diff serviced the next time I bring my car in for maintenance.
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      10-05-2011, 02:15 AM   #13
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^ha ha... do you guys (6mt) hear all the clunking sounds when you shifting from 1st to second? is that normal?
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      11-04-2011, 10:23 PM   #14
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I am bringing this back from the dead as my car has 34k miles and it had the diff fluid changed at 30k miles. However, it is occassionally making the grinding noise as I make slow speed 90 degree turns. Any ideas as to why I might be getting the noise given that my diff fluid was changed fairly recently?

Thanks guys!
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