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06-30-2023, 11:09 AM | #1 |
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Z4MC Differential Oil
I am getting a Z4MC in a couple of weeks. I don't know the service history so I plan to change all the fluids. One issue I need help with is the differential fluid.
From what I read, I need to use gear oil that does not have any friction modifiers. The diff does not currently groan or click. OEM gear oil w/o FM is part no. 83-22-1-467-993. The problem is it looks like BMW discontinued the part and I cannot find any manufacturer that makes a substitute. The only thing I can find is gear oil with FM, part no. 83-22-2-282-583. My understanding is if I use a gear oil with FM, the LSD may click or groan if I ever use a gear oil w/o FM. Can anyone confirm if I am correct about the use of FM in the diff? Has anyone been able to find a diff oil without FM? If I can't get diff oil w/o FM anymore, I may just leave the old fluid in. Sorry if this topic has been beat to death, but I could not find anything recent. I only found old posts when gear oil without FM was still made. |
06-30-2023, 12:08 PM | #2 | |
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Drives: Z4 M, X5, GX460
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.53] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
Quote:
https://www.fcpeuro.com/products/lim...fier-4oz-80301 I believe the ratio of FM to fluid is ~5% |
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07-09-2023, 02:57 AM | #3 |
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You can chose any 75W-140 oil as long as it contain LSD additives.
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BMW M2 LCI -18 | BMW 520DA Touring M-Sport -12
| BMW Z4 M Coupe -06 | BMW M3 -02 | BMW Z3 Coupe -99 | BMW 740i/6 -96 | BMW M5 3.8 -92 | BMW M535i -87 |
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07-09-2023, 05:19 AM | #4 |
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This is what you want, https://www.ecstuning.com/b-castrol-.../001989520310/
As I understand it, the FM was needed for the break in period only.
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07-09-2023, 02:36 PM | #5 |
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The FM was added because many people complained about the noise the diff would make driving around parking lots. The diff would make noise because the friction plates locked/unloaded during low speed tight cornering. The added FM makes the diff works less efficient during spirited/track driving, I would not use it.
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BMW M2 LCI -18 | BMW 520DA Touring M-Sport -12
| BMW Z4 M Coupe -06 | BMW M3 -02 | BMW Z3 Coupe -99 | BMW 740i/6 -96 | BMW M5 3.8 -92 | BMW M535i -87 |
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