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      07-16-2019, 03:05 AM   #1
harkes
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Diff Oil

Hi

Has anyone in here had problems with their diff oil becoming too hot/thin resulting in damage or excessive wear on the diff?

My friend has damaged his Quaife, which is not even clutch based, running OEM BMW 75w90.

I am running Motul 300 75w90 and track my car much less - but I do start to worry a bit.
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      07-16-2019, 11:49 AM   #2
Polo08816
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Quote:
Originally Posted by harkes View Post
Hi

Has anyone in here had problems with their diff oil becoming too hot/thin resulting in damage or excessive wear on the diff?

My friend has damaged his Quaife, which is not even clutch based, running OEM BMW 75w90.

I am running Motul 300 75w90 and track my car much less - but I do start to worry a bit.
Did your friend have significant powertrain modifications or was he largely stock?
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      07-16-2019, 10:34 PM   #3
harkes
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Originally Posted by Polo08816 View Post
Did your friend have significant powertrain modifications or was he largely stock?
Running ~420hp on his Z4 N54 so not a massive power increase.
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      07-17-2019, 09:05 AM   #4
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Quote:
Originally Posted by Polo08816 View Post
Did your friend have significant powertrain modifications or was he largely stock?
Quote:
Originally Posted by harkes View Post
Running ~420hp on his Z4 N54 so not a massive power increase.
What's the stock horsepower rating on his Z4 N54? About 300hp? 420hp would be about a 40% increase over stock. That's pretty substantial.

The type of oil used in the rear differential isn't going to compensate for operating that much out of the stock parameters.
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