01-22-2024, 05:46 PM | #1 |
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Transfer case / Diff Fluid change
As some of you may know, BMW lists these fluids as "lifetime" and not needing change unless there is an underlying problem. For anyone looking to keep their X a long time, have any of you DIY changed these fluids?
I plan on doing it sometime this year around 30k. Can't find any guides on this model but hoping its a simple drain/fill. |
01-22-2024, 09:46 PM | #2 |
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Yes, I did both differentials and the transfer case at 25k miles. Glad I did, as the front diff fluid was very dark. Only reason I can think of is elevated operating temp due to very little airflow and proximity to the oil pan. Plan on doing it every 25k, and the trans at 50k intervals.
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01-22-2024, 10:59 PM | #3 | |
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01-24-2024, 04:13 PM | #5 |
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01-24-2024, 08:24 PM | #6 |
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04-12-2024, 12:35 PM | #7 | |
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04-12-2024, 02:42 PM | #8 |
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What are the symptoms of a differential problem? I had the transfer case replaced recently at 43,000 miles. Since then I have felt, on two occasions, a sliding grinding sound and feeling, just momentary leaving a stop light. This is a 2020.
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04-20-2024, 07:20 AM | #10 |
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My 2020 M50i is at 60k miles with this issue. I've had this issue for about a month. Just FYI for anyone who has CPO, the fluid drain and refill is not covered under CPO, however the transfer case replacement is. Since the fluid drain and refill is not covered under CPO, the diagnosis is also not covered. So it's almost $700 for this service.
My M50i is currently being driven by the technician to achieve the 125 miles. I'm hoping it's the transfer case. I'd hate for my CPO to end later this year, and have this issue return, and transfer case needs replacement. |
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04-20-2024, 02:20 PM | #11 |
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Is there any consensus on whether the transfer case issue is more prevalent in the 50i vs the 40i? I have a 2020 40i with 56K miles and don't have this issue so far. Knock on wood.
I do have an extended warranty that covers the transfer case if it fails. I plan on keeping the vehicle and some say you should change out the transfer case fluid every 50K or so if you plan on keeping it for the long haul. |
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05-14-2024, 06:59 PM | #13 |
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I have a 2020 M50i CPO as well, Service Advisor said the same thing "The way CPO warranty works the tranfer case fluid needs to replaced first that is not covered by CPO and if the problem is still present then they can submit a case to replace the transfer case. But I can't just say to replace transfer case the transfer case has to fail the test"
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Today, 12:00 AM | #15 | |
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Today, 12:46 AM | #16 |
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I have a 2020 40i that just had its transfer case replaced. The car has 37k miles on it. Last year I had the shudder bind issue, and they replaced the fluid but the issue started again this year and they replaced the TC.
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