Thread: PWR radiator
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      03-01-2012, 08:48 PM   #97
Justin@ADVAN Performance
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Drives: N54 135i
Join Date: Jan 2012
Location: Sydney, Australia

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Originally Posted by Autobahn335i View Post
What kills the trannies in the first place? Just the heat?
Stable transmission fluid temps are critical to the correct operation of the multi-plate clutch packs in the transmission.

If the transmission is running outside of its optimal temp, the clutch packs can slip or flare on gear changes, which in turn generates more heat within the tranny and exacerbates the problem.

Poor quality transmission fluid, or fluid that is beginning to break down as a result of excessive service length or heat can also cause clutch pack slippage.

However whilst stable operating temps and high quality fluid are critical to AT serviceability, they still have a torque threshold where the clutch packs will slip regardless of running temperatures or the condition of the transmission fluid.

Last edited by Justin@ADVAN Performance; 03-03-2012 at 09:29 PM. Reason: Typo