Rear Diff Problem?

Zman3 · 10-05-2015, 06:30 PM

Frustrating morning for me...

I had the 1200 mile service last week and was driving the car for the second time since the service. I noticed a grinding sound coming from the passenger rear wheel. I thought I had a pebble grinding the rotors, but I also noticed some fluid under the tire.

I also captured a video of the sound the car was making (try to ignore the hazards blinking).
https://youtu.be/AeX_rME3llY

I pulled the car over and had it taken on a flatbed to the nearest dealership. No update from the service department today, but after a little bit of research here, I think I know where this is headed.

PayamFSU · 10-05-2015, 08:27 PM

sorry to hear that, yeah a humming noise from the rear and leaking rear diff fluid is no good. Did you hit something? Or did did you jack the rear using the diff as a jack point?

Zman3 · 10-05-2015, 11:16 PM

Nope. This is the second time I've driven it in the last week and it's just been sitting in the garage. It was in for the 1200 mile service last Monday. I think I'm prematurely connecting the dots.

I'll find out more tomorrow as the current dealership didn't get a chance to work on it today.

SakhirM4 · 10-05-2015, 11:24 PM

Since they service the diff in the 1200 mile service, maybe something didn't get put back correctly

Zman3 · 10-05-2015, 11:32 PM

Quote:

Originally Posted by SakhirM4

Since they service the diff in the 1200 mile service, maybe something didn't get put back correctly

Well, that's what I'm thinking but I'm trying my best not to jump to conclusions. The dealership my car is at is different from where it was serviced last week. So I feel ill get an honest appraisal of the situation.

happytaco · 10-06-2015, 04:22 PM

They swapped my rear differential fluid to combat this issue. Seems like it fixed the problem.

aclockwrk · 10-06-2015, 06:16 PM

which diff fluid did they have originally and what did they change it to?

10-05-2015, 06:30 PM	#1
Zman3 New Member 3 Rep 23 Posts Drives: MW M3 Join Date: Jul 2015 Location: So Cal iTrader: (0)	Rear Diff Problem? Frustrating morning for me... I had the 1200 mile service last week and was driving the car for the second time since the service. I noticed a grinding sound coming from the passenger rear wheel. I thought I had a pebble grinding the rotors, but I also noticed some fluid under the tire. I also captured a video of the sound the car was making (try to ignore the hazards blinking). https://youtu.be/AeX_rME3llY I pulled the car over and had it taken on a flatbed to the nearest dealership. No update from the service department today, but after a little bit of research here, I think I know where this is headed. Attached Images
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10-05-2015, 08:27 PM	#2
PayamFSU Captain 210 Rep 919 Posts Drives: 2018 F80 ZCP YMB Join Date: Apr 2015 Location: Gainesville, FL iTrader: (3)	sorry to hear that, yeah a humming noise from the rear and leaking rear diff fluid is no good. Did you hit something? Or did did you jack the rear using the diff as a jack point? __________________ 2018 F80 ZCP 6MT YMB/SO 2015 F82 M4 6MT AW/SO - SOLD
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10-05-2015, 11:16 PM	#3
Zman3 New Member 3 Rep 23 Posts Drives: MW M3 Join Date: Jul 2015 Location: So Cal iTrader: (0)	Nope. This is the second time I've driven it in the last week and it's just been sitting in the garage. It was in for the 1200 mile service last Monday. I think I'm prematurely connecting the dots. I'll find out more tomorrow as the current dealership didn't get a chance to work on it today.
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10-05-2015, 11:24 PM	#4
SakhirM4 Major General 10785 Rep 8,852 Posts Drives: '15 SO M4/'20 Z4 M40i Join Date: Jul 2014 Location: Austin, TX iTrader: (0) Garage List 2020 BMW Z4 M40i [10.00] 2015 BMW M4 [8.76]	Since they service the diff in the 1200 mile service, maybe something didn't get put back correctly __________________ Tejas Chapter, BMW CCA, mem #23915, President 27 years, www.tejaschapter.org
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10-06-2015, 04:22 PM	#6
happytaco Private First Class 39 Rep 150 Posts Drives: e90 335i, 15 M3 Join Date: Feb 2015 Location: Norcal iTrader: (1)	They swapped my rear differential fluid to combat this issue. Seems like it fixed the problem.
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10-06-2015, 06:16 PM	#7
aclockwrk Second Lieutenant 55 Rep 255 Posts Drives: '15 M3 6spd Join Date: Dec 2011 Location: South Jersey iTrader: (2)	which diff fluid did they have originally and what did they change it to?
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