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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 07-13-2013, 10:59 AM   #1
Matteo1988
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HELP! Adding limited slip lubricant

I'm adding BG limited slip additive, because I'm getting a loud groaning sound from the back out of my car when I'm at slow speeds and I'm turning. My question is, how would I add the LSD additive? Would I just simply pull the plug and insert where I would the differential fluid? Ty for your help
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Old 07-13-2013, 11:48 AM   #2
sakumaxp
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HELP! Adding limited slip lubricant

I'm pretty sure that's how you would, i assume, but don't quote me


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Old 07-13-2013, 10:26 PM   #3
XIinSC
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That's how to do it.
What kind of fluid do you have in there now? With the correct stock fluid you shouldn't have any noise or need any additives.
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Old 07-13-2013, 10:28 PM   #4
Matteo1988
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I have redline 75w140 in there right now.
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Old 07-14-2013, 02:49 PM   #5
etasport
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I have this same issue, BMW makes an additive fluid for this issue. There is a service bulletin out there.
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Old 07-14-2013, 04:43 PM   #6
Alex323Ci
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the stock BMW M3 diff fluid already has the additive added. i'm not sure they still sell the friction modifier anymore by it's self. *answering another post in the tread.

i think you posted this same question in General Forum. answer is yes undo the top Fill plug and add it. it doesn't take much. also figure the fluid is already at the top of that hole so some likely will dribble out when you undo it.
but you do need to allow the fluid after a rebuild (or change) to work in. i believe it's listed as a several figure 8s to do. limited slip chatter isn't as much a "groan" but a popping or sticking from the clutches on slow turns.
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Old 07-17-2013, 03:14 PM   #7
FTLAUDM3
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I had the same groan noise. Installed the new version fluid and it is now gone. Drain old fluid, install new fluid, and do a bunch of figure 8's in either direction. They only added the FM booster in 04 and later I believe. This is one area that you should definitely use OEM fluid. Its over $50per bottle and you need 3. You will use like 2.5 bottles. Word of advice - check your Differential first. Mine is starting to leak very slowly (Black around the drive shaft area). Get that fixed before you change the fluid if it's leaking. I am going to reuse the fluid since mine has like 300 miles on it.

The redline is great for most cars, but the m3 LSD is not like most cars. Use the OEM fluid with the FM booster. I run Royal Purple in my Transmission, and using Liquid Moly in the engine (actually runs cooler according to the temp gauge) when driving aggressive or rush hour traffic. May try Motul in the oil department next. I only used Castrol TWS for years and tried Liquid Moly and my engine has not blown up yet. Doesn't mean anything against wear, but I sleep ok at night either way.
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