OK Buckslad, Heres the layout..
Early versions were equipped with a dipstick.On later Models this was eliminated.
On Cars without an ATF level dipstick, it is recommended that the ATF level checking be left to authorised BMW dealer with the appropriate temperature measuring equipment. The most accurate check of the ATF level is best done on a lift with the engine running in neutral and the ATF at a specific temperature..
You could still do the job if you have a hydraulic lift available as the car must be level when refilling,and the ATF at a temperature of 30-55c (86-131F).
Place the transmission in neutral and start the engine. With the ATF at the specified temperature, add ATF until it spills from the filler hole..
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Happy ATF