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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 12-08-2011, 10:58 AM   #1
jwdunn
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Join Date: Nov 2011
Location: Boston
Posts: 3
My Ride: 2002 bmw m3
Unhappy ***Differential Problems*** Help!

Hey i have a 2002 BMW m3 convertible smg. Imola red :-)

i recently noticed i had a pretty bad pinion seal leak on my differential. I jacked the car up and replaced the diff fluid with mobile 1 70/90. after about 200 miles i'm still hearing a rubbing noise when i go around turns at low speeds. i figured maybe the fluid just leaked out again. so i jacked the car up again (level both times) and checked, but the diff fluid was still full? do i need a new diff? any thoughts? i'm really stumped.

I'm was planning on doing all the seals over christmas break. however is it worth it? or am i better off getting a new/used diff?

oh when the problem started i put about 100 miles on the diff with low fluid. i'm at school and i had to get it home to my garage.

any help would be truley appreciated

thanks

Jared

feel free to email me directly if you would like
jaredwdunn@gmail.com
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Old 12-08-2011, 11:01 AM   #2
FTLAUDM3
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Join Date: Jan 2006
Location: Ft. Lauderdale
Posts: 1,493
My Ride: M3, Z4
You should change fluid. Worth a shot. Put the approved OEM diff fluid with the FM booster. Its not cheap ($120 for three bottles). Then go do some figure 8's in a parking lot. Helps get the fluid working.
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Old 12-08-2011, 11:03 AM   #3
flashmeow
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Like the other dude posted...you need the bmw diff fluid with fm booster. This fluid is design for LSD

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Old 12-08-2011, 11:06 AM   #4
Jtrem
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Join Date: Jun 2011
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My Ride: '05 e46 M3 6spd.
It's seriously a must to use the BMW diff fluid with the FM booster. So many people have thought they had blown their diff's, but just had the wrong fluid.

Replace it with the BMW approved fluid, then do some figure 8's like noted above, and the noise will go away. Mobil 1 fluid doesnt have the friction booster which LSD diff's need!
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Old 12-08-2011, 11:50 AM   #5
jwdunn
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Question

thanks. is there anything else i should look for while re doing the seals and putting in the new fluid?

http://www.ecstuning.com/BMW-E46-M3-...luid/ES197413/

Im assuming this is the fluid i should get?

has anyone redone the seals and had a similar problem?
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Old 12-08-2011, 12:09 PM   #6
flashmeow
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Quote:
Originally Posted by jwdunn View Post
thanks. is there anything else i should look for while re doing the seals and putting in the new fluid?

http://www.ecstuning.com/BMW-E46-M3-...luid/ES197413/

Im assuming this is the fluid i should get?

has anyone redone the seals and had a similar problem?
BMW no longer make rubber gasket for the diff. you need to buy the BMW gasket maker (made by loctite).
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