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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #26  
Old 09-21-2013, 01:19 PM
dkindig dkindig is offline
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Location: Murphy, NC
 
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Posts: 314
Mein Auto: '01 Z3 3.0i Roadster
The viscosities recommended are as follows:

Standard open diff: 75W90
Torsen LSD: 75W110
M cars with clutch-type LSD: 75W140

Amsoil DID make a difference with my diff, not a huge one, but definitely quieter.
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  #27  
Old 09-21-2013, 07:21 PM
ZEEBOY ZEEBOY is offline
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Location: SW Ohio
 
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Mein Auto: 2001 Z3 Coupe and 2003 Z4
Based upon my comments on this thread a few years ago, this will be a little contradictory, but here goes..I have owned four Z3s and I now believe the rear axles in most of these cars have some whine to one degree or another....I do not know if BMW buys their differentials from a specific supplier or if they are made in house...but one thing is for sure, they never really addressed the issue...also, even though I praised the Amsoil a few years ago, I now think that was initial euphoric optimism...it really did not help much...I can honestly say that my two 60's/70's mgs have much less axle whine..having said that...the best car I have ever owned is my 2001 Z3 coupe that I currently drive...yes, I have learned to live with that annoyance. :-)
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  #28  
Old 09-28-2013, 03:41 PM
tohbi tohbi is offline
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Mein Auto: z3 '97 atlanta blue 2.8
whine can usually be reduced by a thicker oil. make it a synthetic and get superior lubrication, too. the multi-grade of the oil mentioned may make it more effective for this problem but i don't use amsoil due to their truly crappy shipping dept.

mobil makes good synthetics available almost anywhere and i've used royal purple to good effect.
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  #29  
Old 05-26-2014, 02:47 PM
Paul P Paul P is offline
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Location: Pulaski, TN
 
Join Date: Sep 2013
Posts: 18
Mein Auto: 1997 Z3
Quote:
Originally Posted by Paul P View Post
Where do you get Amsoil and the BGLSII & how much does it take to change it. Thanks
Update, Changed it out with no change in noise.
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  #30  
Old 09-20-2014, 11:09 AM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
Quote:
Originally Posted by Paul P View Post
Thank you, I'm new to this forum but am really impressed how helpful everyone is. Really appreciate the info.
I solved my problem, see my new post today, Thanks, Paul
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  #31  
Old 09-20-2014, 11:19 AM
ZEEBOY ZEEBOY is offline
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Location: SW Ohio
 
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Posts: 162
Mein Auto: 2001 Z3 Coupe and 2003 Z4
Congratulations Paul...I hope you purchased a lottery ticket the same day you swapped axles...grin
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  #32  
Old 09-20-2014, 12:26 PM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
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Hello, My mechanic, Neds car care wouldn't believe it. He said he has worked on BMWs 30 years and never had a bmw differential bad but he put it on the rack with his helper inside running it 50 mph with slight pressure on brake for load and used his stethascope to prove it was the diff. It worked and the place I bought it guaranteed it to be quiet, said he never had one with a problem. Paul
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  #33  
Old 09-29-2014, 04:59 PM
miriamelaine miriamelaine is offline
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Location: Marin County CA
 
Join Date: Sep 2014
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Mein Auto: 2000 Z3 2.8 Roadster
Z3 Diff whine

SO what happened? Did you have the work done and does it still whine?
I am going round and round with my whine and unlike some, I cannot
tolerate it . Please post results and thanks !!!
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  #34  
Old 09-30-2014, 04:55 AM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
Miriamelaine, It is perfect, no whine at all. My mechanic moved here from Ca and he's the best. I'm in Middle Tennessee, Wish you were close so he could solve yours too. Like I said before, bought it on car-parts.com for $350 and $277 labor and lube and It's like a different car. Those folks that say a little whine is normal are wrong. Don't give up on it. Thanks, Paul
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  #35  
Old 09-30-2014, 05:03 AM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
Differential Noise

--------------------------------------------------------------------------------
Here is my Post after It was solved.
I had asked a while back for solution to Whining noise in my 1997 Z3 automatic. I changed to the heavier lube and also found left axle Joint binding but nothing solved the problem. Had some tell me it was normal because you sit so close to the differential. One told me it was my torque converter. Anyway, wanted to share my cure. I got on line with car-parts website and found a 1998 differential with 60k on it for $350 and paid $277 for labor and flush and clean and lube and it's perfect. No noise, seems like a different car. Also found out they only offered one diff. for this model so didn't have to wonder which one was right. Hope this helps someone with that problem. Paul
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  #36  
Old 09-30-2014, 07:57 AM
ZEEBOY ZEEBOY is offline
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Mein Auto: 2001 Z3 Coupe and 2003 Z4
Paul...really glad you solved your problem by purchasing another differential. My question is this...has anyone ever successfully FIXED an existing differential that was on their vehicle? So many folks have this problem, but I have never heard of anyone having their diff successfully repaired...other than putting in heavier diff oil to mask the problem, who has made a mechanical repair to address the problem?
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  #37  
Old 09-30-2014, 10:07 AM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
Hello, I have not heard of anyone repairing their differential. You can search nation wide at car-parts.com for a used one. I found one with 60k on it and it's perfect. Thanks, Paul
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  #38  
Old 09-30-2014, 05:29 PM
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vintage42 vintage42 is offline
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Location: Louisville, KY
 
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Mein Auto: 1997 BMW Z3 1.9 5MT
Once the gears have been worn or damaged to the point of whining, there may no repairing except by replacing the gears. The parts and labor are expensive, and the skill in shimming the gear fit for quiet running is critical and uncertain. It is cheaper and surer to buy a good used intact differential.
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  #39  
Old 10-03-2014, 07:40 AM
Pine1000 Pine1000 is offline
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Location: South Carolina
 
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Mein Auto: 2000 BMW M Roadster
For the record, my diff was also whining in my 20000 //M and stopped when I changed the fluid with Mobile 1 LS 75W90.

I'm not sure what was in the previous owner had in there, but he did have the car serviced at grease monkey. So, who knows? It was probably the first can of gear oil on the shelf at the time...
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  #40  
Old 10-03-2014, 01:16 PM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
Glad you got it solved. I had put Amsoil 75w140 in mine and it made a little difference but not enough to live with. Paul
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  #41  
Old 10-06-2014, 10:30 AM
druid druid is offline
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Mein Auto: 2009 Triumph Rocket 3
Quote:
Originally Posted by michaeldauben View Post
Does anybody have experiences with a whining noise coming from the rear differential of a Z3? You only hear it with the top closed, around 50 mph, then it disappears completely at higher speeds and comes back around 75/80 mph. Mileage of the car is not even 30kmls. The whining noise was not always there. At some point in time it started and gradually increased. A BMW service Rep. claimed this is normal, can not be repaired and may happen again with a brandnew differential. Any thoughts or experiences? THANKS!!!
I had 2000 2.3 checked - they found a broken tranny/diff strap/hanger/mount and replaced it.
This reduced the whine but did not eliminate it.
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  #42  
Old 10-08-2014, 05:52 PM
Paul P Paul P is offline
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Location: Pulaski, TN
 
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Mein Auto: 1997 Z3
Hello, Your symtoms are the same as mine, quiet with top down but very irritating with top up and they also told me it was normal but it's not. Mine had 46k on it and the lady I bought it from said it had always had the little whine as she called it. You read my post so you know what I did and now mine is perfectly quiet. Don't give up on it. Paul
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