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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 05-30-2012, 01:00 AM   #21
Rockyminator
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Join Date: Jan 2011
Location: Portland Oregon
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My Ride: HPF Stage 2.5 M3
Quote:
Originally Posted by n3985 View Post
Because they sell the diff fluid WITHOUT FM booster too.
What he said! ^^
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Old 05-30-2012, 05:32 AM   #22
dafoe
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Location: Frederick, MD
Posts: 64
My Ride: LSB M3
OP, OEM Diff fluid ALWAYS!! That stuff it liquid GOLD!
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2001 M3, LSB 6spd, purchased 6/09 with 25K miles.


Mods: Evolve Airbox & Tune, SGT swaintech coated headers, OEM Euro Cats, Larini exhaust, 3.91 gears, Turner Pulleys, TCKline S/A coilovers, H&R front sway Bar, Rear Sway Bar, RE Strut bar, PowerFlex RTAB's, Apex ARC-8's, subframe reinforcement, Laser Int:thumbsup2:
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Old 06-02-2012, 07:37 PM   #23
nyredeye21
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Join Date: May 2008
Location: Brooklyn
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My Ride: 2003 E46 M3
Thanks for all the replies. I bought that kit from ecs tuning and I got it but some of it leaked out. I will most likely change it tomorrow
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Old 06-03-2012, 07:54 AM   #24
duramax
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My Ride: 2002 BMW M3
diff fluid

redline 75/90
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Old 06-05-2012, 08:44 AM   #25
hassmaschine
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Location: Ferndale, WA
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My Ride: '91 325ix
if I had an M3, royal purple products wouldn't come anywhere near it..

really - how often do you have to change the diff fluid? maybe 3-4 times over the life of the car? I feel the same way with coolant. Yeah, it's an extra $20 for the BMW stuff - but that's spread out over two years. I've seen the damage from using cheap fluids and it's just not worth it. BMW stuff is formulated exactly for your car, you don't have to guess or hope it will work.
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Old 06-06-2012, 07:31 PM   #26
dafoe
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My Ride: LSB M3
FWIW, I have 391 gears recently installed, they used non OEM diff fluid, and it made noise, added the OEM with FM booster, no more noise, AT ALL! I'm telling you guys, the stuff is unmatched!
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2001 M3, LSB 6spd, purchased 6/09 with 25K miles.


Mods: Evolve Airbox & Tune, SGT swaintech coated headers, OEM Euro Cats, Larini exhaust, 3.91 gears, Turner Pulleys, TCKline S/A coilovers, H&R front sway Bar, Rear Sway Bar, RE Strut bar, PowerFlex RTAB's, Apex ARC-8's, subframe reinforcement, Laser Int:thumbsup2:
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Old 01-23-2013, 11:47 AM   #27
TopazID
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Join Date: Dec 2012
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My Ride: 2002 BMW M3
i apologize for bumping such an old thread.. but has anyone tried the Redline Limited Slip Friction Modifier?? If so, any thoughts or reviews about it?
I recently changed my diff fluid with RL 75W-140 and i started hearing the whine. My shop recommended this:
http://www.redlineoil.com/product.aspx?pid=41&pcid=4
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Old 01-25-2013, 02:23 PM   #28
TopazID
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Quote:
Originally Posted by PowerM3 View Post
I used royal purple and had noise from my diff. Do yourself a favor and use OEM!
I used readline 75w-140 and it made loud chattering, whining noise. Swithed back to OEM expensive but it fixed the problem
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Old 01-25-2013, 07:21 PM   #29
46smg
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Quote:
Originally Posted by TopazID View Post
I used readline 75w-140 and it made loud chattering, whining noise. Swithed back to OEM expensive but it fixed the problem
Exactly, expensive but at least you know it fixes the problem the first time. Somethings you can use aftermarket, but somethings you just stick to oem.
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Old 01-31-2013, 01:32 PM   #30
KhanArt
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Quote:
Originally Posted by dafoe View Post
OP, OEM Diff fluid ALWAYS!! That stuff it liquid GOLD!
+1, OEM trans, diff, oil..
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Old 02-01-2013, 08:45 PM   #31
emax
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My Ride: 06 M3
OEM! I used a few years ago and its still good. The BMW limited slip diff is very picky and likes the FM booster...and no you can't by the booster by itself. If you swap the locker, you can use different fluid.
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Old 02-01-2013, 09:20 PM   #32
M3 FOR LIFE
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Use oem only...
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Old 02-02-2013, 09:11 AM   #33
KhanArt
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OEM.. I put that sh1t on everything!
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Old 02-02-2013, 10:08 PM   #34
Prdquik
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Quote:
Originally Posted by KhanArt View Post
OEM.. I put that sh1t on everything!
Now that's funny.
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Old 02-05-2013, 07:08 AM   #35
Ridnfly
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I had this same issue with 75-90, went with OEM and all is well. Expensive lesson.

Quote:
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I used readline 75w-140 and it made loud chattering, whining noise. Swithed back to OEM expensive but it fixed the problem
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Old 02-05-2013, 08:35 AM   #36
KashM3
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Quote:
Originally Posted by KhanArt View Post
OEM.. I put that sh1t on everything!
YES! FRANKS.....

made my morning

OP: OEM + FM. Why risk the chance of strange noises...
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