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E34 (1989 - 1995)

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  #1  
Old 07-12-2013, 04:29 PM
Dad67 Dad67 is offline
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Location: Lincoln Park,NJ
 
Join Date: Jul 2013
Posts: 27
Mein Auto: e34
Redline 57904 for limited slip differential

Hi,

I'm sorry - I searched forum and did not found answer, May be it was answered already, did not find it. Decided to ask anyway.

My son just bought bmw 525i made in 1993 with 300K miles on it and when I looked at the bottom I found one BIG MESS- differential was cowered with sick layer of oil. I followed directions on the forum and Bentley, took it out, cleaned everything, put new seals and while it was on the ground I put inside 2 qt of Red Line 57904 (75w90). I have tag on the differential S323 6091 (see pic attached). It starts from S and bentley say this is Limited Slip differential.

According to Amazon (this is where I bought it) Red Line 57904 (75W90) Synthetic Gear Oil - 1 Quart is for Limited Slip Differentials. After I put everything back I drive about 30 minutes with the speed about 40 mph to check if there will be any leak. After I came back I checked- no leaks BUT differential is getting hot. Not like water boiling temperature but when I touch it with hand and it is hot. May be about 100-120F- can not say exact temperature.

Question- Is it normal?

Before I started this repair I drive about 10 minutes to warm up oil in differential before I drain it- it was warm but not hot.

Thank you so much!
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  #2  
Old 07-12-2013, 05:22 PM
snowsled7 snowsled7 is offline
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Location: SW Mountains
 
Join Date: Mar 2012
Posts: 980
Mein Auto: GTI
It will get pretty hot, more than 100-120* F after a highway run. The oil is good for over 300* F before you start to see problems. The case on mine has lots of cooling fins, I figure, if they are hot they are working

If you are really concerned, borrow or purchase an IR heat sensor gun. Run the car for an hour and check the temp of the case. I seriously doubt there is a problem and, Redline is a very good product. If you have no leaks, you should be in great shape.

I have had Amsoil in diffs, that required additional LSD friction modifier to keep the diff from chattering in tight corners, even though it was supposed to work with LSD's. Something else to pay attention too.

I used Redline MTL in my transmission, man that trans is crisp for 17x,xxx miles! Great stuff, worth the premium for me.
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Last edited by snowsled7; 07-12-2013 at 05:24 PM.
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  #3  
Old 07-12-2013, 07:27 PM
Dad67 Dad67 is offline
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Location: Lincoln Park,NJ
 
Join Date: Jul 2013
Posts: 27
Mein Auto: e34
Redline 57904 for limited slip differential

Thank you!


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  #4  
Old 07-15-2013, 11:27 AM
imae34driver imae34driver is offline
FCK HONDA
Location: Orange County , CA
 
Join Date: Feb 2013
Posts: 2,040
Mein Auto: 1995 540i SPORT /6 spd
1 quart? I just built my large case diff and it hold 2.1 quarts.. I dont believe it should be double a small or medium case diff.. Are you sure you are not 1/4 to 3/4 quart low? You should fill it till it comes back out the fill hole while level.. Then its full

You are running the thinner of the 2 viscosity's available. Im personally choosing to break in all my bearings and seals with 140w. The thinner fluid will generate heat faster especially if a bit low..

And last of all.. This just here say, or more here "read" actually..

Maybe its just the gkn units, maybe all bmw LSD's but many swear redline murdered there LSD unit..

Don't take it from me, just what i have read..

Last edited by imae34driver; 07-15-2013 at 11:34 AM.
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  #5  
Old 07-15-2013, 05:26 PM
MySatinDoll MySatinDoll is offline
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Location: Next door bring tools and beer.
 
Join Date: Jan 2011
Posts: 1,414
Mein Auto: 1995 e34 S52b32/5
I just did this but used 2 liters of Mobile 1 LSD synth 75w90.
So far so good. Hell even my speed sensor is beginning to respond correctly.
*which could have meant it was dirty.

Anyway when it comes to redline, I too have heard both sides of the story
like Imae34driver.
Since the job is done, sled stated not to worry to much unless it gets above the 300* F range.
I agree for it shouldn't be an issue unless you have a leak or something equivalent to a diff failure.
Both something a visual inspection, audible notation, or ride quality change can bring to the surface.

Good luck.
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  #6  
Old 07-15-2013, 05:34 PM
imae34driver imae34driver is offline
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Location: Orange County , CA
 
Join Date: Feb 2013
Posts: 2,040
Mein Auto: 1995 540i SPORT /6 spd
Quote:
Originally Posted by MySatinDoll View Post
I just did this but used 2 liters of Mobile 1 LSD synth 75w90.
So far so good. Hell even my speed sensor is beginning to respond correctly.
*which could have meant it was dirty.

Anyway when it comes to redline, I too have heard both sides of the story
like Imae34driver.
Since the job is done, sled stated not to worry to much unless it gets above the 300* F range.
I agree for it shouldn't be an issue unless you have a leak or something equivalent to a diff failure.
Both something a visual inspection, audible notation, or ride quality change can bring to the surface.

Good luck.
2.1 quarts = 2 liters.. So he would be slightly over 50% low..!

So it better not leak now hahaha

Last edited by imae34driver; 07-15-2013 at 05:36 PM.
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  #7  
Old 07-17-2013, 03:39 PM
Dad67 Dad67 is offline
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Location: Lincoln Park,NJ
 
Join Date: Jul 2013
Posts: 27
Mein Auto: e34
its 2 qts

hi, I put there 2 qts ( 2 bottles)- I copied link from Amazon- it sold in 1 qt bottles. Sorry for confusion.
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