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Discussion Starter #1 (Edited)
Hello all.... I've got some grinding noise in the rear-end when turning sharply while car is cold... I read on this board that it is probably the differential fluid which will probably need to be replaced.... what does this entail and cost? Does it need to be fixed? It goes away once car has warmed up a bit. My M5 is not under warranty. Thanks! J.B.
 

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Had the same problem with mine. Shop (dealership since I just got the car and haven't found an independent local independent shop) said that they wanted to drive in figure 8's for about 20 mins and that should be the fix. I guess if the car sits for a while the plates in the rear end loose all the oil. When you make a sharp turn when the car is cold, the rear wheels are turing at different speeds. With no oil you get the grinding noise.

I looked thru the history and found the Service Bulletin had never been inplemented (changing the diff oil). So had them go ahead andchange it. Of course they found a leaking differential seal, so they had to replace that which apparantly requires disassembling most of the car (not quite, just kidding). At the end of the day the bill was $1,000. And it's still making the noise!!! I need to get it back in...but just cringe at the thought of having to go to the dealership again.
 

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And it's still making the noise!!! I need to get it back in...but just cringe at the thought of having to go to the dealership again.
After they replace the diff oil w/ the new upgraded oil, it takes some time for the sound to go away, around 600 miles +/- or so.

tech service bulletin:

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SI B33 01 02
Rear Axle January 2009
Technical Service

SUBJECT
Grinding Noise from the Differential during Slow Cornering


MODEL
E46 M3 from start of production

E60 M5 from start of production

E63, E64 M6 from start of production

E90, E92 and E93 M3 from start of production

E85, E86 with S54 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

Drain the differential oil. Refer to the appropriate model repair instruction in TIS:

Main Group 33 / Subgroup 10 / RA 0011259.

Refill the differential with special differential oil as shown in the illustration below.

Differential fill capacity = 1.2 liters (1.3 quarts).


Remove the seal (1) between the bottle cap and neck.

Pull the filler tube (2) out of the bottle.

Remove the cap (3) from the filler tube (2).

Insert the filler tube into the fill hole in the differential and with the bottle positioned under the output shaft, squeeze the bottle to transfer the oil into the differential.

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.

PARTS INFORMATION
Part Number
Description
Qty.

83 22 2 282 583
Special differential oil kit
1

Contains 3 bottles - .5 liters (.53 quarts) each

(order quantity 1 : bill out quantity 3)

WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.

Defect Code
33 10 92 39 00

Replace differential oil with special oil

Labor Operation:
00 53 267

Labor Allowance:
3 FRU
 

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Excellent info. Guess I'll put a few miles on it and see before I hunt down my service advisor!!
 

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I've read on this board, and elsewhere that the sound isn't actually causing damage or shortening the life of the rear diff. It's merely an annoyance to here. Can anyone here speak to whether this is true or not?
 

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I've read the same thing. But if the cause of the noise is because the gear oil isn't fully covering the plates on a system that is designed to be covered, I'm not sure if I can see how it's not causing some sort of (at least) increased wear. Maybe some fretting on the loaded side of the gear teeth. I'm hoping the threads are correct and there isn't any damage. But just in case I'll try to minimize the sharp turns when it's cold for a few hundred miles.
 

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I experienced the same noise on my first test drive in my car. Had heard a similar noise in other differentials so I wasn't concerned. Noise went away after the second day. If you are still hearing it I would take that service bulletin to service advisor and ask what the cost would be. Good luck!
 
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