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Old 11-13-2012, 02:15 PM
F32Fleet F32Fleet is offline
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Location: SE United States
Join Date: Jul 2010
Posts: 1,988
Mein Auto: 435i, 335d sold.
Originally Posted by Pierre Louis View Post
My experience has been the same. Automatic transmissions use a thin layer of fluid between plates to create the friction surface, which as you can imagine, has a lot of heat generated. If the fluid is not synthetic, it breaks down even more easily. I have changed it in as little as 13,000 miles to find it to be seriously discolored. Black and junky after 44,000 miles on a Honda.

The larger fuel filters found in TDI's seemed never to have any water when I drained them, nor did they need changing for at least 30K miles.

You can find UOA's on LG6 taken from AT's with over 70k miles and they came back fine. I've personally spoken to an engineer at ZF who informed me that outside their severe service interval the fluid can easily go 100k miles. The mechtronics is the key to long fluid life and once the fluid is changed the transmission needs to be reset (clear adaptations?) so the mechtronics will adjust to the new fluid characteristics (sp?).
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