Hi Ean,
This has been a hotly debated point for quite sometime and the general consensus seems to be that given that there is a considerable amount of oil left in the torque convertor etc and how sensitive the the ZF gearbox is to various oils , ie; some oils create unwanted slippage and some may actually cause damage {refer caverd3 about this for more info}, it is far safer with these auto boxes to just use genuine oils for the entire task.
Personally i didn't do the flush just a genuine oil change at 100k and will do another at 120 when the next major is due.


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