Bought my 540i last month. Going through all the maintenance items since I don't have a complete history on it.
Just got done replacing the following:
- Air filter
- Diff fluid with Mobil 1 75w90
- Trans fluid with RP Synchromax
- Clutch/Brake fluid flush (DOT 4).
- Oil and filter (Mobil 1 0w40, Mann HU938/4X)
Flush of power steering deferred until I verify whether or not one of the hoses has a slow leak.
Coolant not replaced. The cooling system was replaced not more than a year ago based on the date code on the Behr radiator and the condition of the other parts - WP and thermostat housing.
Also, in the process of cleaning/conditioning the leather seats with Zaino Z-9/Z-10.