10-05-2022, 10:43 AM | #1 |
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Front/Rear Diff & Transfer Case Oil Change Advice
2019 F90 with 23,500 miles, in service for just shy of 4 years (December 2018). Dealer is pushing front & rear diff & transfer case oil based on length of service, not mileage, but I am reluctant based on recommendation for mileage being around 50K before these are done. I was thinking of doing it around 40,000 miles, but I need more learned advice from some experts in this forum. Help is much appreciated
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10-05-2022, 11:05 AM | #2 | |
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10-05-2022, 11:10 AM | #3 | |
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10-05-2022, 02:18 PM | #4 |
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Yes, front & rear diff changed at 1200, not 1800. Dealer called while it is in for oil change to scare me into doing diffs & transfer oil by stating that "if the services aren't done by the recommended time it could affect your warranty on the parts." What warranty? I'm out of warranty. Is this just typical stealer BS?
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10-05-2022, 05:29 PM | #5 | |
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And yeah, he's blowing smoke on the warranty. Shawn |
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10-06-2022, 10:12 PM | #6 | |
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If I would have known at the time I would have changed it long before 65k miles.
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10-06-2022, 10:16 PM | #7 |
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There is a schedule for every fluid but the trans. BMW says the trans fluid is lifetime but apparently ZF has a schedule. That trans is used in many vehicles by other manufacturers and I wonder whether they also use lifetime fluid.
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10-06-2022, 11:30 PM | #8 | |
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And, as above, the center "transfer case" has been a weak part of the X-drive system for eons. Multiple "rebuild" videos on youtube. BMW is one of the few that says "lifetime". "In most, if not all other vehicles that have the 8 speed ZF transmission, the manufacturer recommends a transmission fluid and filter change at 70,000 to 80,000 miles. This is also the interval that ZF themselves recommend." https://gearsmagazine.com/magazine/t...filter-change/ But, I have read some of the procedures to change this fluid. Especially in all wheel drive configuration, it appears to be a GIANT pain in the ass. You'd probably get away with a drain and refill if you did a mililiter for mililiter replacement, but I don't know. Shawn |
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10-07-2022, 06:47 AM | #9 |
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I have seen this in a few places, but here is a link to pdfs at one of those places.
https://f90.bimmerpost.com/forums/sh....php?t=1605537 |
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10-16-2022, 12:40 AM | #11 |
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Those oils are not subject to combustion blow by, fuel or moisture in the air. They break down over use not time. You are supposed to change spark plugs every 30k/3 years with BMW. If you only drove 15k over 3 years, would you change them?
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10-16-2022, 07:16 AM | #12 |
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People who are doing early oil changes are confused by the BMW service trigger that is based on the number of oil change resets done to the computer, which then signals another service is due. Read the service schedule and you should understand.
Nothing wrong with servicing early, however, and I sort of subscribe to the theory that age can be a substitute for mileage if the mileage spec is not reached but the number of years that might normally equate to that spec have passed. At least for some things. |
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10-17-2022, 06:20 AM | #13 | |
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10-17-2022, 06:57 PM | #14 |
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Excellent point. I don't think that anyone here thinks that the overly aggressive app-driven diff oil change recs are driven by anything but profit by those lovely people at BMW. Thank goodness for the indy mechanics for those of us who lack the DIY skill-set.
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10-17-2022, 08:13 PM | #15 | |
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In this thread, the oil change interval is said to be overly aggressive to make a profit. Both points are unlikely to be true together. Likely one is and one is not, or they are both true. Agree or disagree? Shawn |
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10-18-2022, 07:51 PM | #16 |
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Just crossed 33k miles and got the same app alert for diff fluid change. I had already changed them myself back in April around 30k miles, along with the transfer case fluid and the transmission. The manufacturer of the transmission recommends changing the fluid, so that's what I will be doing. Changing earlier is always better.
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10-18-2022, 09:07 PM | #17 | ||
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I think bmw service recommendations are 90% financial based and 10% engineering based. Plus or minus. Haha.
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10-19-2022, 12:04 AM | #18 | |
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A 75,000 mile interval for our ZF-8hp transmissions might help make them A LOT of money. But, leaving them might result in a destroyed transmission and a full replacement. Doubt that 75,000 mile and up M5's are getting this done at BMW though. And, that transmission is "off the shelf" from ZF and can be gotten from other "recycled" cars. Not sure I agree with you. But, it's just a thought. Shawn |
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10-19-2022, 12:07 AM | #19 | |
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The tranny SOUNDS hard if you follow the BMW service procedure. Any recommendations? Old fashioned knowledge is to drain, measure, and replace. But with the replaceable pan (which supposedly contains a filter), that sounds even more troublesome. Interested in your procedure. (or did you have the dealer do it?) Shawn |
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10-19-2022, 07:01 AM | #20 |
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I don’t think the pan has to be replaced. On my E61 535xi it was plastic with integrated filter and I drain plug. I replaced it. I think my 2018 M5 has an aluminum pan with drain plug but I would have to put it back on the lift to check. The transfer case looked like it had easier service access than the one on the 535.
I have all fluids but trans and will do them sometime in the next year. 41k on 2018. The trans can wait until 60k miles. |
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10-19-2022, 07:03 PM | #21 | |
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10-19-2022, 07:15 PM | #22 |
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Here's the info from ZF. To fill with the new fluid, you will need a manual pneumatic fluid transfer pump (go to ECS tuning). And you will need a scanner that can read the transmission temperature, and a low range torque wrench and I think torx head sockets for the bolts. You have to jack up the car on all four corners in a way that it is level.
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