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The fill plug is up on the side of the transmission and is used to monitor level (with the vehicle running, cycled through R & D, 2000rpm in N for 30 sec, then A/C on, recirc on high). I used a thermocouple sensor to monitor sump oil temp. I verified the factory fill level this way prior to changing.
I had the vehicle in for other warranty work afterward and they verified level was set correctly.
I find the BMW/ZF procedure is not all that different in principle from some other mfg auto transmissions.
Getting the tech info was more difficult than the mechanical part.
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