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On a 2008 BMW but it's still a ZF transmission of the type similar to ours. When you get your first fluid and filter change on your ZF, around 60-70K miles in normal use, replace the five seals between your valve body and main section of the ZF.
(And NO!!! it's not lifetime fluid!). Bridge seals age, dry and crack.
Bridge seal in uploaded photo in case the video disappears.
The importance of the bridge seal
