Transmission Oil on 2002 BMW 745Li

How do I fill up transmission oil tank and how do I know when it's full?

3 answers
The transmission on your vehicle is actually sealed for life. As is on most BMWs.
It's important that you follow the manufacturers instructions when checking and adding fluid, especially the type of fluid. I suggest getting a good repair manual, it will have this info for your specific vehicle, look at Bentley, they are the best for European cars:
you must fil transmission box for the transmission oil go out said