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      06-13-2012, 09:08 PM   #1
badbimmer
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Leak Around Differential

While changing my rear brake pads today, I noticed oil around rear diff. Anyone have this issue?
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      06-13-2012, 09:21 PM   #2
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You will have guys who say some weeping around the diff is normal..Im not one of them..

Likely a failing seal..is the leak bad? (i.e., dripping on the ground) if so dont drive the car for too long before getting it looked at
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      06-13-2012, 09:59 PM   #3
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I had a leak on mine at around 42k miles. Called to set an appointment & was told that this is "very unusual" for the M3. They actually had to order the seal as it was not stocked. I would get 2 or 3 drops when I parked, then nothing for several days... I don't abuse/race my car and my mileage is 90% highway. It seems that we both have the same unusual problem! My car was done in about 4 hours. (Exhaust, driveshaft & carrier bearing must come out) Just make sure that they have the seal in hand. It is 100% covered under warranty and absolutely dry now after 3,000 miles.
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      06-14-2012, 05:41 PM   #4
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dripping= no; weeping around the seals IMO is very normal and I do see it on alot of cars as well as my old e46 m3.. The seals are an easy DIY if the car isn't under warranty
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      06-14-2012, 10:26 PM   #5
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Weeping or Leaking around seals absolutlely not normal and never is. That's why it is called a "seal".
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      06-14-2012, 10:28 PM   #6
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Quote:
Originally Posted by badbimmer View Post
Weeping or Leaking around seals absolutlely not normal and never is. That's why it is called a "seal".
Agreed..once you have weeping the risk is not so much fluid leaking out as it is dirt and contaminants getting in..and we all know what happens after that
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      06-14-2012, 10:29 PM   #7
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Quote:
Originally Posted by Blue92 View Post
I had a leak on mine at around 42k miles. Called to set an appointment & was told that this is "very unusual" for the M3. They actually had to order the seal as it was not stocked. I would get 2 or 3 drops when I parked, then nothing for several days... I don't abuse/race my car and my mileage is 90% highway. It seems that we both have the same unusual problem! My car was done in about 4 hours. (Exhaust, driveshaft & carrier bearing must come out) Just make sure that they have the seal in hand. It is 100% covered under warranty and absolutely dry now after 3,000 miles.
Did you have any symptoms?

I get a very bad vibration on decelration, when I let off the gas at higher speeds arounf 5k when rpm drops to around 4K. Not sure it's related. I can't duplicate the issue every time. But it's getting worse when it does happen.
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      06-14-2012, 10:39 PM   #8
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You will have guys who say some weeping around the diff is normal
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      06-14-2012, 11:04 PM   #9
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Quote:
Originally Posted by MoirJuli View Post
You will have guys who say some weeping around the diff is normal
You will always find someone contrary to what logic dictates. They can say "seals leak and it's no big deal".. It normal. Or they can say "its normal for your car to pull slightly the left".

Protect your car... when seals leak or weep, replace the seals. Otherwise, you next stop will be replacing the costly part that the leaking seals were protectng. Not good.

Amyway, anyoe curious on the brake pads I Installed? Hint is CC
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      06-15-2012, 01:36 AM   #10
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Quote:
Originally Posted by badbimmer View Post
Did you have any symptoms?

I get a very bad vibration on decelration, when I let off the gas at higher speeds arounf 5k when rpm drops to around 4K. Not sure it's related. I can't duplicate the issue every time. But it's getting worse when it does happen.
No symptoms at all here. Car drove as normal. (Believe me, I was all over the rear differential mounting bolts after reading those posts!) The absolute only symptom was the few drips on my concrete floor. I will also add that my car does not have the high dollar diff lube.
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      06-15-2012, 02:12 PM   #11
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Quote:
Originally Posted by Blue92 View Post
No symptoms at all here. Car drove as normal. (Believe me, I was all over the rear differential mounting bolts after reading those posts!) The absolute only symptom was the few drips on my concrete floor. I will also add that my car does not have the high dollar diff lube.
By the time you would have experience any symptoms..the damage may have already been done due to contamination or oil loss..looks like you caught in time..a very good practice to always look on the ground after moving you're car
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      06-15-2012, 02:59 PM   #12
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I had this issue at ~45K or so. BMW had no issue replacing the seal. IMO, a car with ~45K miles shouldn't weep or leak any fluids from anywhere.
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      06-15-2012, 09:36 PM   #13
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Quote:
Originally Posted by tibra1 View Post
By the time you would have experience any symptoms..the damage may have already been done due to contamination or oil loss..looks like you caught in time..a very good practice to always look on the ground after moving you're car


^ Would totally agree with tibra.... I didnt know we had so many techs in here. ( or forum reader retards, read something online, and bring it in to the dealer with all kinds of amazing knowledge that nv existed. jk) I work as a tech at a dealer(Toyota), not bmw, but have buddies who do. Warranty claims always have to be very well documented, and long story on why something is being replaced or done. Dealership will not get reimbursed if warranty claims gets denied. Most jobs like diff seals are gravy as hell, so ussually will be taken care of. expecially if its lead by " customer states diff. is leaking fluid".... vs. Customer states he sees a "small amount of weepage around diff area" Dealership is always going to do their best to make you happy...... A diff seal should not leak, or weap. while some seals like rear mains may weap and considered to be normal. theres such a gray area. any amounts to where theres a drip on the ground is not normal...
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      06-15-2012, 10:20 PM   #14
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oil seals should not weep, period. if a seal is weeping, that is your time to replace it before you get completely hosed. if a pinion seal leaked on a rear end, how long until you burn up the rear diff.

replace the seal. seals are cheap. diffs are not.
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      10-24-2016, 01:41 PM   #15
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Bringing back an old thread, but any of you have had leaking from the diff?

E90 6MT owner here w/78K km or about 50K miles, and while I was replacing my exhaust, I saw this. Should order the seal I guess... anyone has a part #?
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      10-24-2016, 07:25 PM   #16
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thats way too much.
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      10-25-2016, 07:16 PM   #17
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Any tips? Do it myself, let a shop do it? Which seal should I order? Any specific one prone to failure?
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      10-25-2016, 08:48 PM   #18
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Quote:
Originally Posted by lockeed
Any tips? Do it myself, let a shop do it? Which seal should I order? Any specific one prone to failure?
Is it leaking from the pinion (front) or output seals? That will tell you what seal needs replaced. Sure it's not coming from drain or fill plug? Dropping the diff is not overly complicated but not fun.
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      10-26-2016, 10:35 AM   #19
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Thanks for the info, I couldn't really see where the leak was coming from last week... I'll check where the leaks seems to come from on a lift, and I'll know more about it. Hoping it's just a loose plug!!
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      10-26-2016, 12:36 PM   #20
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Quote:
Originally Posted by M3PO View Post
I had this issue at ~45K or so. BMW had no issue replacing the seal. IMO, a car with ~45K miles shouldn't weep or leak any fluids from anywhere.
X2, BMW replaced the seal for me
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      02-20-2017, 06:56 PM   #21
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Is there a diy to fix this issue? Mine is just a light film of oil in the area but I want it fixed. Thanks
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      02-20-2017, 07:21 PM   #22
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Is there a diy to fix this issue? Mine is just a light film of oil in the area but I want it fixed. Thanks
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