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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Mechanical Maintenance and TSBs: Break-in / Oil & Fluids / Servicing / TSBs and Service Bulletin > Rear differential leak
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      12-08-2018, 09:44 PM   #23
n00bkiller944
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Originally Posted by sspade View Post
Can you link exactly what you used?

Or a part number?

And the exact quantity you had to buy?
https://www.fcpeuro.com/products/gea...ly-99991754600

I bought two bottles but only ended up using 1.
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      01-05-2019, 07:11 PM   #24
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Originally Posted by jh_f30 View Post
Cool. Thanks. But any reason to believe the LiquiMoly (or any other quality synthetic 75w90) won't be ok? I've got it on order, so I'll give it a shot regardless and report back should the diff blow up.
I used it in my fluid change about 2k miles ago. I will let you know 2k miles ahead of you if it blows up lol
Any problems so far?
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      01-05-2019, 08:16 PM   #25
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Originally Posted by n00bkiller944 View Post
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Originally Posted by jh_f30 View Post
Cool. Thanks. But any reason to believe the LiquiMoly (or any other quality synthetic 75w90) won't be ok? I've got it on order, so I'll give it a shot regardless and report back should the diff blow up.
I used it in my fluid change about 2k miles ago. I will let you know 2k miles ahead of you if it blows up lol
Any problems so far?
None for me. All good.
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      01-06-2019, 06:19 AM   #26
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Originally Posted by jh_f30 View Post
None for me. All good.
Cool. I'm putting it in my rear diff this morning then. Liqui Moly's website recommends their 75w-140 (LM4420) for F3x differential(s), but I couldn't find it for sale anywhere. Based on this thread I went ahead and got 75w-90 (LM2048).

EDIT: Looks like LM4420 is sold in the U.S., however its English part number is LM20042. Liqui Moly recommends this 75w-140 for F3x differentials, however also says that it's really intended for LSDs. Those of us with open diffs should be fine with 75w-90, which is part number LM2048.

Last edited by Sweeney921; 01-06-2019 at 07:54 AM..
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      01-06-2019, 09:32 PM   #27
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Quote:
Originally Posted by Sweeney921 View Post
Cool. I'm putting it in my rear diff this morning then. Liqui Moly's website recommends their 75w-140 (LM4420) for F3x differential(s), but I couldn't find it for sale anywhere. Based on this thread I went ahead and got 75w-90 (LM2048).

EDIT: Looks like LM4420 is sold in the U.S., however its English part number is LM20042. Liqui Moly recommends this 75w-140 for F3x differentials, however also says that it's really intended for LSDs. Those of us with open diffs should be fine with 75w-90, which is part number LM2048.
Still good for me too! About 4k miles since the fluid change.
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      03-16-2019, 09:06 PM   #28
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i just noticed this today and i'm fucking pissed because i knew i should've checked before warranty ran up, forgot, and now see it's weeping. has anyone had luck just tightening the bolts? it looks like it would be a nightmare to remove the rear cover as it's structural
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      03-17-2019, 04:18 AM   #29
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i just noticed this today and i'm fucking pissed because i knew i should've checked before warranty ran up, forgot, and now see it's weeping. has anyone had luck just tightening the bolts? it looks like it would be a nightmare to remove the rear cover as it's structural
Oil usually weeps from the shaft seals, not the cover. For me both side seals were replaced soon after the pictures and it has been dry since. I was told there has also been leaking front (pinion) seals but in my case that one was fine.

Mine was done by the indy garage I always use and paid by the company where I bought the car from, I saw the quote it was about $250 parts (two seals and bmw G1 hypoid oil) and $250 labor. Those are his list prices as it was not me paying.
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