Rear diff leak, any ideas?

fast330i · 11-07-2024, 11:17 AM

Hello, I’ve recently noticed I have a lot of leak on the rear differential, anyone ever encounter this?

I’ve did some search and came up to this:

https://bmwrepairguide.com/sib/330315.pdf

Anyone else thinks this is the cause?

Car: X5M 2017 F85

John H. · 11-08-2024, 12:29 PM

Clean the area with brake cleaner. Re-check area.

That being said, there appears to be much moisture. Check for loose bolts. Also, check the shaft seals.

tdott · 11-08-2024, 12:42 PM

dont be lazy, take the shields off.

Check the front and sides to see if it is leaking from any of the seals. Those are the most likely places for it to leak.

RockCrusher · 11-10-2024, 10:21 AM

No experience with BMW diff leaking. But the front diff leaked on my 996 Turbo. Turned out to be the axle flange seals.

As has been suggested clean the diff thoroughly with brake cleaner. If you can remove the shields first.

After the diff is clean drive the car for a while then back home on your driveway back car onto ramps and with a bright light look over the diff.

11-07-2024, 11:17 AM	#1
fast330i @fast330i 2 Rep 18 Posts Drives: G20 - 330i - 2019 Join Date: Sep 2023 Location: Romania iTrader: (0)	Rear diff leak, any ideas? Hello, I’ve recently noticed I have a lot of leak on the rear differential, anyone ever encounter this? I’ve did some search and came up to this: https://bmwrepairguide.com/sib/330315.pdf Anyone else thinks this is the cause? Car: X5M 2017 F85 Attached Images
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11-08-2024, 12:29 PM	#2
John H. Lieutenant 438 Rep 536 Posts Drives: 2022 G15 Join Date: Jun 2017 Location: Orange, CA iTrader: (7)	Clean the area with brake cleaner. Re-check area. That being said, there appears to be much moisture. Check for loose bolts. Also, check the shaft seals.
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11-08-2024, 12:42 PM	#3
tdott Brigadier General 4064 Rep 4,099 Posts Drives: M3 Join Date: Nov 2010 Location: South FL / 6ix iTrader: (4)	dont be lazy, take the shields off. Check the front and sides to see if it is leaking from any of the seals. Those are the most likely places for it to leak. __________________ N/A S65 Headers Before/After Dyno Results
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11-10-2024, 10:21 AM	#4
RockCrusher Lieutenant Colonel 1586 Rep 1,515 Posts Drives: BMW 2023 ZB M2 6-speed Join Date: Jun 2022 Location: Benton County, AR iTrader: (0)	No experience with BMW diff leaking. But the front diff leaked on my 996 Turbo. Turned out to be the axle flange seals. As has been suggested clean the diff thoroughly with brake cleaner. If you can remove the shields first. After the diff is clean drive the car for a while then back home on your driveway back car onto ramps and with a bright light look over the diff.
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