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      10-11-2022, 06:07 PM   #2
Blueboxer
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Drives: 2011 535
Join Date: Apr 2013
Location: California

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I would call your service department, if I recall correctly, the ZHP 8 speed is a closed system and they don't recommend doing the fluid change at all. I few people will do it right before their warranty up, figuring if it goes, it will go then while it is under warranty, but whenever I asked for a transmission flush, I was always told it wasn't recommended.
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