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      11-17-2023, 01:36 PM   #67
Boostedphil698
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Drives: 2015 BMW 435i Xdrive MSport
Join Date: Mar 2020
Location: Greater Philadelphia

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2015 BMW 435XI  [0.00]
2009 Honda Civic  [0.00]
Quote:
Originally Posted by isenc2 View Post
Here is what Wavetrac says:

Your new Wavetrac® differential is incredibly durable and will withstand the harshest environments...as long as suitable oil is used. Many customers ask what oil we recommend for use with the Wavetrac® differential. We feel the best answer is:
Use the "factory fill."
In other words, use the gear oil spec that your car manufacturer recommends for your car. The Wavetrac® is compatible with virtually all factory-installed gear oils used today. If you are racing your vehicle, and wish to upgrade the gear oil to improve performance or durability in racing conditions, choose the oil carefully: be aware that some gear oils have additives that are not recommended for use with your Wavetrac®.
Some have friction modifiers designed for limited slip differentials. These modifiers generally increase slipperiness and are intended to reduce clutch disc chatter in conventional clutch-type LSDs. Some gear oils such as Red Line Oil's Shockproof® type have microscopic solid particles in immersion in order to "cushion" transmission components, acting as an extreme pressure agent. The Wavetrac® and all helical gear differentials in general, operate using friction. The friction generated between its internal gears and its housing are what allow this type of differential to function.
Gear oil additives that drastically reduce friction will actually reduce the performance of gear differentials. The internals of the diff get too slick to generate adequate friction - reducing the differential's effectiveness - reducing its ability to drive both wheels.
In [...]
I'm familiar with the wavetrac language and I would follow it. But, reach out to Dan and see why he recommends Redline despite wavetrac saying otherwise.
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2015 435i Xdrive (Klaus)
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