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that's what I do. start draining and refilling the pan at 50k. every 2 or 3 oil change I do it. I measure what comes out and put the same amount in because ZF's fill procedure is a PITA.
we are now on our third BMW with ZF auto. wife's cars. x5 4.4 went 170k and x5 4.8 went 120k without issues.
mine were all manual transmissioned but now I have a DCT so we will see.
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