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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY E90 Rear Differential Oil Change



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HRC's Avatar DIY E90 Rear Differential Oil Change
HRC
05-12-2010
Tools needed:

14mm Hex - 1/2" drive
1/2" drive Ratchet
Transfer Pump
Jack Stands/Ramps
Low profile floor jack


Specs (Thanks to Agentphish):

Plug: 60 Nm (44 ft lb)

Aspiration Rear...
  #110  
By ska///235i on 01-10-2014, 09:32 AM
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Quote:
Originally Posted by big_c
So, I ordered a couple quarts of redline 75w-90 to do this. Car is a 335i with 94k on it. Its been dealer maintained and I have all service records from PO- was a little old lady.

I squeezed underneath the car very easily, and cracked open the fill plug with the breaker bar. Piece of cake.

However, I was startled to find that the fluid (presumably factory fill unless somehow the lady changed it..doubtful) looked like new.

I checked it and put it on paper, was a perfect honey color like new XO fluid. So im wondering....do I continue with the fluid change as most of the darkness and particles has gravitated to the bottom and I only saw the very top nice fluid?

Or do I return the red line fluid and assume that its still ok?
Did you drive around (warm up the oil) first? If so, leave it alone
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  #111  
By big_c on 01-10-2014, 11:02 AM
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Quote:
Originally Posted by ska325xi View Post
Did you drive around (warm up the oil) first? If so, leave it alone
Nah, the car was sitting for a few days when I checked the fluid.

Ill check it after driving around today and see if the fluid still looks good.
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  #112  
By big_c on 01-12-2014, 10:05 PM
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Quote:
Originally Posted by big_c View Post
Nah, the car was sitting for a few days when I checked the fluid.

Ill check it after driving around today and see if the fluid still looks good.
Changed it, glad that I did. The fluid looked pretty good in small amounts, but when it was in a larger container, it looked like somewhere between honey and maple syrup. Not bad at all for the amount of miles on it...very impressed with the fluid. Other cars I've changed look much darker and thicker.

Its only $30, and I know for sure the level is right and the fluid is new. By the way- its a piece of cake to do this without jacking the car up at all. Just get a fluid transfer pump from harbor freight.

I bought two quarts of the fluid and only used .3L or so - so if anyone wants to save a few bucks and buy the rest of my Redline fluid, PM me
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  #113  
By Agentphish on 01-13-2014, 07:51 PM
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Quote:
Originally Posted by big_c View Post
Its only $30, and I know for sure the level is right and the fluid is new. By the way- its a piece of cake to do this without jacking the car up at all. Just get a fluid transfer pump from harbor freight.
You didn't even need to jack it up to extract? Really?
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  #114  
By mi_bimmer on 01-13-2014, 08:32 PM
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Quote:
Originally Posted by big_c View Post
I bought two quarts of the fluid and only used .3L or so
Wait, what? It takes about 1.2 quarts. Are you sure you pumped in enough or was that just a typo?
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  #115  
By Agentphish on 01-28-2014, 02:33 PM
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FYI, Torque spec supplied by me in the OP's original post is from the Bentley Manual.
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  #116  
By big_c on 01-28-2014, 04:18 PM
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Quote:
Originally Posted by Agentphish View Post
You didn't even need to jack it up to extract? Really?

Yep. I have the sport package as well. 245 lbs and 6'1 fit under there with no issues, much easier than leveling it
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  #117  
By big_c on 01-28-2014, 04:41 PM
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Quote:
Originally Posted by mi_bimmer View Post
Wait, what? It takes about 1.2 quarts. Are you sure you pumped in enough or was that just a typo?
An unclear statement, only used .3 from the second bottle and minus spillage, have about half a bottle left in case any of you guys need it-

Total fluid fill was 1.2 L
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  #118  
By Agentphish on 01-28-2014, 04:51 PM
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Quote:
Originally Posted by big_c View Post
Yep. I have the sport package as well. 245 lbs and 6'1 fit under there with no issues, much easier than leveling it
yeah I looked under my car the day I read that comment and you're right. It's not far under there.
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  #119  
By TGTIW on 02-15-2014, 11:42 AM
Just changed my diff oil this morning (21,000 miles), really an easy procedure. Oddly though, it took about 1.2 qts of Redline 75w-90 to fill it, but I was only able to suck less than a qt out.
Has anyone else noticed that their diffs might have been under filled from the factory?
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  #120  
By mweisdorfer on 02-20-2014, 04:36 PM
Amsoil

I would replace this fluid every 50k with Amsoil and also put in a magnetic drain plug.
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  #121  
By Agentphish on 04-27-2014, 10:26 PM
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Finally did this after several months of putting it off.

55,500 mi 328i sedan. Old stuff looks yucky, but I'm sure it's still fine. Whatever. Nice to know new RedLine stuff is in there now.


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  #122  
By tman on 05-23-2014, 09:21 AM
Thanks Op!! Just did my E90 330i. Hardest and most time consuming was jacking up the car to be level and high enough. Used Redline 75W90. The stuff that came out was dark brown.
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