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Re: ZF transmission:
Manufacturer says to change every 60K miles.
Bavarian autosport and my local Indy shop says to change every 2 years or 50K miles, which ever come first. The change includes a new filter and replacement pan with bolts. The Indy shop has said to NEVER have your tranny flushed. Just change the fluid and filter and you'll be good to go. Many issues with flushing of tranny. Non-BMWs can be flushed with a lower pressure flush, but not the Bimmers.
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