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      04-03-2018, 09:08 AM   #1
JayZap16
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Found my Differential to be leaking :(

So this past weekend I was installing my Remus mid-pipes (which I love by the way). When I was removing and reinstalling my exhaust I noticed that the differential has a class two leak, meaning there is no droplets forming/present. However, you can see fluid. It appears to be seeping where the passengers drive shaft meets the diff.

I will post photos today when I get back under the replace an exhaust hanger. I will be stopping by the dealer to talk to my SA today and will update with what they say. I literally just picked up my car from my service after they replaced my strut mounts/bearings last week.

Luckily, I am on warranty still.

Any one ever has a similar issue, gets me nervous seeing how our M active diffs are serious pieces of complex engineering.
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      04-03-2018, 11:02 AM   #2
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Supposedly its the same diff as the M5/M6. It should be stout.

Also, I thought mine had a leak in the same location. It turned it to be extra fluid that had come out of the breather on top of the diff housing. Worth looking.
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      04-03-2018, 08:24 PM   #3
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I would clean it up, and check the fluid level..

Check to make sure it is not overfilled, open the fill screw and let any extra fluid leak out. Do this on a level surface or on a lift.
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      04-04-2018, 02:01 AM   #4
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Mine leaked from same place - pass side. They replaced the seal and have not had any problems. It leaked while still under warranty - maybe 30k miles? At 80k now.
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      04-04-2018, 07:04 AM   #5
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Same side here. Fixed under warranty.
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      04-04-2018, 07:33 AM   #6
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Wow, so I need to pay my indy shop to check for leaks (ala pre-purchase inspection) on oil pan gasket, OFH, vavle cover gasket and rear diff on the last year of warranty
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      04-04-2018, 08:30 AM   #7
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Quote:
Originally Posted by 5soko View Post
I would clean it up, and check the fluid level..

Check to make sure it is not overfilled, open the fill screw and let any extra fluid leak out. Do this on a level surface or on a lift.
Ya I am hoping that this will be the case. Pain in the butt though doing it with the car just on jack stands.
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      04-04-2018, 08:35 AM   #8
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The dealer has me scheduled next week to have it taken a look at.

Here are the pics I took yesterday.



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      04-13-2018, 01:38 PM   #9
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Dealer replaced the seals and we are good to go
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      05-11-2018, 05:23 AM   #10
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Quote:
Originally Posted by MrSmartyPants View Post
Supposedly its the same diff as the M5/M6. It should be stout.

Also, I thought mine had a leak in the same location. It turned it to be extra fluid that had come out of the breather on top of the diff housing. Worth looking.
Only for the M2, M3 and M4. x-referencing the part number reveals this much.
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      10-25-2018, 07:00 PM   #11
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looks like i joined the club today. noticed a small pool of oil on the ground of my parking stall. called my service advisor and he put me up on the first free hoist in the shop and... passenger side seal had failed and was leaking/dripping fluid.

is this common? is it a lengthy repair job? it's under warranty but i have to wait for a service loaner so it could be awhile for it to get fixed...

Last edited by fabulousprofound; 10-26-2018 at 12:47 PM..
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      10-26-2018, 12:42 PM   #12
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Originally Posted by fabulousprofound View Post
looks like i joined the club today. noticed a small pool of oil on the ground of my parking stall. called my service advisor and he put me up on the first free hoist in the shop and... passenger side seal had failed and was leaking/dripping fluid.

is this common? is it a lengthy repair job? it's under warranty bu have to wait for a service loaner so it could be awhile for it to get fixed...
When I had it fixed they had it done in like 2 days, didnt even have to drop the diff to my understanding.

Covered under warranty
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      10-26-2018, 12:48 PM   #13
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Quote:
Originally Posted by JayZap16 View Post
When I had it fixed they had it done in like 2 days, didnt even have to drop the diff to my understanding.

Covered under warranty
wow two days... for some reason i thought it would be a quick pop out bad seal stuff new seal in and refill
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      10-26-2018, 01:09 PM   #14
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Quote:
Originally Posted by fabulousprofound View Post
wow two days... for some reason i thought it would be a quick pop out bad seal stuff new seal in and refill
I am sure thats what it was, but drop off the car in the morning, it goes on the lift that afternoon, its finshed in the morning, they call me in the afternoon to tell me its done, I pick it up the morning after, so three days lol
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      10-26-2018, 02:47 PM   #15
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Quote:
Originally Posted by JayZap16 View Post
Quote:
Originally Posted by fabulousprofound View Post
wow two days... for some reason i thought it would be a quick pop out bad seal stuff new seal in and refill
I am sure thats what it was, but drop off the car in the morning, it goes on the lift that afternoon, its finshed in the morning, they call me in the afternoon to tell me its done, I pick it up the morning after, so three days lol
Same here. Mine went in for scheduled service. Found out about drive shaft recall and then they called and said they had to take rear diff apart, no oil left. More to come, I'm down about a week or so they said.
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      10-27-2018, 09:52 PM   #16
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Quote:
Originally Posted by Memphis17CPM4 View Post
Same here. Mine went in for scheduled service. Found out about drive shaft recall and then they called and said they had to take rear diff apart, no oil left. More to come, I'm down about a week or so they said.
was your diff making any noise while dry?

the axle was flinging the oil leaking from the seal all over the place so the drip pattern on the ground was confusing as hell to diagnose without the car coming off the ground...
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      11-05-2018, 09:36 PM   #17
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well things went from bad to worse for me. came out after work to see this...



service dept. still has no loaners to give out. they said if i want this done asap i need to leave the car with them and go to the local car rental to get something to drive while it gets repaired.

Last edited by fabulousprofound; 11-06-2018 at 04:18 PM..
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      11-06-2018, 03:59 PM   #18
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I guess I better check this out before my warranty expires. Thanks!
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      11-14-2018, 04:24 PM   #19
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i finally got my seal fixed under warranty, although the service tech initially said no because my car is lowered about an inch on KW HAS coilovers and wanted to blame the leak on that. Thankfully my SA came to my defense and it was finally approved and replaced.

But the left seal... should I be worried? Do these things fail in pairs? So far what little I could find online seems to be only the right seal that goes bad.

Last edited by fabulousprofound; 11-28-2018 at 07:13 PM..
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      11-28-2018, 05:57 PM   #20
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Add me to the club, just had this fixed. Wasn't dripping or anything so they just replaced the seal. Took them 2 days to keep the car, sure it wasn't that long just probably did mine when they had time.

They did not replace or flush any fluids.. just swapped seals and back it went.
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      12-03-2018, 09:11 PM   #21
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What model year are these effected cars?
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      12-04-2018, 09:03 AM   #22
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Quote:
Originally Posted by fabulousprofound View Post

But the left seal... should I be worried? Do these things fail in pairs? So far what little I could find online seems to be only the right seal that goes bad.
Right seal (passenger side) on our 2015 M4 had a very small leak. Right side is OK.
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