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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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Old 09-21-2013, 12:19 PM
dkindig dkindig is offline
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Location: Murphy, NC
Join Date: Nov 2009
Posts: 313
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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Old 09-21-2013, 06:21 PM
ZEEBOY ZEEBOY is offline
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Location: SW Ohio
Join Date: Nov 2006
Posts: 147
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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Old 09-28-2013, 02:41 PM
tohbi tohbi is offline
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Location: arizona
Join Date: Aug 2011
Posts: 387
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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Old 05-26-2014, 01:47 PM
Paul P Paul P is offline
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Location: Pulaski, TN
Join Date: Sep 2013
Posts: 6
Mein Auto: 1997 Z3
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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