08-22-2020, 10:52 PM | #89 |
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I see, so alot less stress has been put onto the diff in its life time so I would reckon not too much damage has been done. It is best to probably switch the fluid asap.
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08-23-2020, 12:23 PM | #91 | |
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Also weird it happens at specific speeds it makes me think it's transmission. Does it happen in every gear or only specific gears?
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08-23-2020, 01:03 PM | #93 |
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Hmm weird, it is hard to tell without being there in person. Try a diff fluid flush and see if it it fixes it.
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08-23-2020, 05:08 PM | #95 |
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I see, hopefully you get it all sorted out.
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08-24-2020, 03:18 AM | #96 | |
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What oil do you recommend then, the OEM BMW MSP/A (part no 83222365988) Or is there an aftermarket alternative? BTW the 922 oil part number is not recognised by real OEM or BMW parts retailers here in the EU...
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08-24-2020, 12:44 PM | #98 | |
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Yes I recommend the OEM msp/a, keep it safe imo these diffs are way too expensive to play it risky. Just do frequent flushes if you track alot and you should be fine. I also don't believe you would get any gains with an aftermarket oil like you would with engine oil because you won't really increase weight so you shouldn't get any more shear stability at higher temps. Sure the base stock of oil might be more durable but I doubt the shear stability would increase too too much as a result especially if it has to meet bmw's requirements, because that could mess with how the clutch packs engage hence why all the oils are 75w-140. If you cannot get msp/a get saf-xj, then if you cannot get that go after market with syntrax first then all the other options last. Yeah I always said it was supposed to be msp/a 83222365988, and not saf-xj. Which is weird why the usa is pretty much all using SAF-XJ. This is even weirder because the US normally gets things Canada doesn't because their market demand is larger. I'm not really complaining so thanks bmw for not giving Canada the short end of the stick like most companies would lol. But overall what I've noticed was Canadian cars, EU cars, not sure about Aussie cars all get MSP/A. The US gets SAF-XJ, I am not sure about mexico or south america because not many people post service reports.
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08-24-2020, 12:50 PM | #99 |
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Good idea but it might be hard to get a good idea of wear compared to other bmw specific averages because I do not think alot of bmw owners oil test their diffs. There will probably be alot of metals as well from clutch pack wear. But regardless it should be a good idea.
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08-25-2020, 10:53 AM | #101 | |
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They're gonna replace it for free w the correct fluid and I feel like that's pretty much all I can reasonably ask for seeing as how there's been no issues and it's been 3 years. If there's problems down the road I'll always have the original work order to point to, so that's something I guess.
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08-25-2020, 11:19 AM | #102 |
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My ordeal has bothered me so much that I ordered 2 more bottles of the rear end fluid to change it again myself before my road trip next month. I plan on having the other fluid analyzed.
At some point I'll get over it, just not yet.
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08-25-2020, 12:37 PM | #103 | |
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Your next argument is that SAF-XO is not even meant for lsd's and only for open diffs, and that is printed on the bottle and has been for awhile. There was a tsb on that too extended back to vehicles from 2011, but the date of publication is unknown. So imo unless your dealership doesn't brief every tech on tsb's and the tech doesn't follow ista protocol then this should not have occured. Yeah hopefully they replace your oil, also try to get them to flush it like described with JustinHEMI's m2.
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08-25-2020, 12:39 PM | #104 |
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Yeah better to be on the safe side. Make sure you also buy a new fill and drain bolt because they are single use. Also the bolts are H14 not for bolts, so don't use a torx socket or you might strip the bolt.
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08-31-2020, 08:52 AM | #105 |
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Sorry if this was already posted and I missed it— I found a copy of a differential technical service document from 2016, which includes "F87 (M2 Coupe): SERVICE ACTION: REPLACE REAR-AXLE DIFFERENTIAL. It lists part # 83 22 2 357 992 for the final-drive gear oil and is described as "Final-Drive Gear Oil MSP/A (1000ml)".
There may be newer revisions of this document on bmwtis.com, so unless someone already has access, I might pay the $30 to see what I can dig up. Edit: This document refers to part # 83 22 2 357 992 as "MSP/A", while all of our running in service records refer the same part # as "SAF-XJ". . Last edited by CKr; 08-31-2020 at 10:21 AM.. |
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08-31-2020, 10:05 AM | #106 | |
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There is also a tsb website that someone posted above that lets you download full PDFs, check that out before paying for anything.
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08-31-2020, 10:20 AM | #107 | |
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I should have clarified in my post— the document I posted refers to part # 83 22 2 357 992 as "MSP/A", while all of our running in service records refer to the same part # as "SAF-XJ". This seemed to be one point of confusion in the thread. |
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08-31-2020, 11:08 AM | #108 | |
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New fluids (not updated fluids) would have new part numbers so 992 cannot be SAF-XJ.
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09-02-2020, 03:28 PM | #109 |
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Same thing happened to my F80 back in 2015 when they filled SAF-XJ+FM during the break-in service.
I would have never found the mistake had they not also broken multiple iDrive functionalities during the same service, prompting me to do a full verification run of everything they touched, including spending a week to learn how to re-flash the ECU myself. My solution was simple: I have never again let any dealer touch any of my cars since that day. These days I rent a stall/lift in a DIY shop every 6 months and take care of my cars myself. I was wondering if I could potentially let them touch it for the 1200 mile service on my M2C, hence perusing this sub-forum. I got my answer, loudly and clearly. |
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09-02-2020, 03:40 PM | #110 | |
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Also if you don't let them do the run in service you have to make sure you deactivate the run in feature yourself. Also you're gonna have a difficult time getting warranty in the future.
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