The general advice from ZF is that the oil should be changed every 50 - 80,000 miles, depending on how hard the transmission is stressed or every eight years.
Agreed. This 'filled for life' advice is now recognised as not being oner of BMW's finest hours.
Technically, it's do-able as a DIY job at home, for the more capable. Ideally though, get it done at a garage, preferably a transmission specialist or a BMW-independent specialist.
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