Ok, I'm at 126,000 and working up the confidence to do the transmission fluid and filter change .... found this on ZHP site. I have 2011 x5 35d


Workshop Hints
The GA6HP26Z automatic gearbox requires oil
replacement every 100,000 miles. Only the
approved oil must be used for replacement or
after conducting repairs on the gearbox (consult
the Operating Fluids information). Check oil
level:
• The vehicle must be parked flat and level
• Check the oil level through fill plug (1) corresponding
to the Repair Instructions (TIS)
• Observe the oil temperature *
* Diagnosis of this gearbox is carried out with
the DISplus as part of the service an