any Marconi Dexron compatible oil should do it.
I have a leak on the high pressure hose, but still toping it up when necessary. I'll replace it next year... as an early warning for having low level of ATF, pay attention to any strange noise when steering at low speed, especially in cold wheather... regular visual inspections is a good idea as well till you fix your problem

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BMW X5 3.0si 2008
Premium Package
Light Package
Navigation
Reverse Camera
Rear Sensor (retro-fit)
Comfort Access
Spare Wheel
Power folding mirrors
Voice Control w Bluetooth
Power trunklid

BMW X3 3.0i 2006
M Aerokit
M Sport Package
Navigation System
BT Handsfree
Xenon HID

BMW X5 3.0i 2001 --- SOLD