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      03-17-2019, 03:12 AM   #1
wdskukm3
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What differential oil to use in my M3?

So i'm planning to replace the diff fluid soon. I'm just confused on what fluid I should be using. Everyone says just stick with the regular SAF-XJ but the dealer says to use the XJ with the booster added. I do here some chattering at times when making slow turns. Haven't made any noise lately. Maybe because its cold.
But then there's the MPS/A fluid which everyone recommends as well.

So what fluid should i be using. Don't want to be using the wrong fluid in my diff.
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      03-17-2019, 05:52 AM   #2
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Go to RealOEM and enter your VIN or model. Then go to the diagram of the rear axle, select driveshaft and look up part number 11.

“The current oil specification is "BMW final drive oil synthetic MSP/A" (for e.g. Castrol SAF-XJ) and is the same oil used in the previous M vehicles with variable M differential lock.”

E.g.
83 22 2 357 992
83 22 2 365 988

https://www.newtis.info/tisv2/a/en/f...ive/1VndHi1Cfw

Last edited by G4BR13L; 03-17-2019 at 06:06 AM.
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      03-17-2019, 08:20 AM   #3
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Quote:
Originally Posted by wdskukm3 View Post
So i'm planning to replace the diff fluid soon. I'm just confused on what fluid I should be using. Everyone says just stick with the regular SAF-XJ but the dealer says to use the XJ with the booster added. I do here some chattering at times when making slow turns. Haven't made any noise lately. Maybe because its cold.
But then there's the MPS/A fluid which everyone recommends as well.

So what fluid should i be using. Don't want to be using the wrong fluid in my diff.
Your dealer is wrong. The regular fluid is what the F8x uses, not the FM version that prior M cars used. It's significantly cheaper too 👍
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      03-17-2019, 08:27 AM   #4
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Originally Posted by gatorfast View Post
Your dealer is wrong. The regular fluid is what the F8x uses, not the FM version that prior M cars used. It's significantly cheaper too 👍
The link I posted literally says that:

“We will also accept no liability for any consequences resulting from the use of additives.”
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      03-17-2019, 09:44 AM   #5
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So why is ECS and other reputable dealers recommending the XJ with FM Booster in their kits.

Also will the MPS/A fluid help with the minor chattering on slow turns.
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      03-17-2019, 09:59 AM   #6
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Quote:
Originally Posted by wdskukm3 View Post
So why is ECS and other reputable dealers recommending the XJ with FM Booster in their kits.

Also will the MPS/A fluid help with the minor chattering on slow turns.
I literally read that BMW explicitly mentioned to not use additives. Dealers still do it because it was good for years for older M cars but not for our cars.
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      03-17-2019, 12:33 PM   #7
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Quote:
Originally Posted by wdskukm3 View Post
So why is ECS and other reputable dealers recommending the XJ with FM Booster in their kits.

Also will the MPS/A fluid help with the minor chattering on slow turns.
ECS is wrong. I generally refer to them as well for things like this but in this instance their system is wrong. I went through this research several months ago when i changed my diff fluid. You can call any dealership and give them your vin and they will tell you that your car takes the regular diff fluid not with the FM. I even reached out to the service departments of several reputable forum sponsors and all C.J. firmed that the regular fluid is the correct one for the F8x.
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      03-17-2019, 01:36 PM   #8
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on a lot of websites you can purchase the diff oil with FM booster and they claim that it is good for the F8x which is totally not correct.

Here is an example:
https://www.turnermotorsport.com/p-2...x-m3-f8x-m3m4/

Also see:
https://f80.bimmerpost.com/forums/sh....php?t=1516283
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      03-17-2019, 02:16 PM   #9
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Will any of this fluid without the fm booster help with the chattering of the diff. Just trying to avoid that grinding sound it makes at times during slow turns.
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      03-17-2019, 02:20 PM   #10
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Quote:
Originally Posted by wdskukm3 View Post
Will any of this fluid without the fm booster help with the chattering of the diff. Just trying to avoid that grinding sound it makes at times during slow turns.
What noise? I don’t have noises coming from the rear diff, if yours makes noise you need to first figure out where the noises are coming from.
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      03-17-2019, 03:39 PM   #11
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It's a chattering sound from the rear diff. Only on slow turns the chattering happens at times. Hasn't happen lately though. Just want to avoid it if it happens again. Or just need to drive it more to keep those discs lubricated.
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      03-17-2019, 06:29 PM   #12
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If you are hearing a noise I would bring it to the dealership to have them diagnose the issue.
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      04-12-2019, 11:17 PM   #13
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Quote:
Originally Posted by G4BR13L View Post
“The current oil specification is "BMW final drive oil synthetic MSP/A" (for e.g. Castrol SAF-XJ) and is the same oil used in the previous M vehicles with variable M differential lock.
83 22 2 357 992
This is the part number I got from my local dealer today. Non FM. He spent 15 minutes looking it up and confirming.
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