You have to make sure that you get the right oil for the type according to your gearbox code, should be able find that in service book or on the gearbox.
As H-M3 and Roberto said about the change itself, I only drained and renewed the filter, this doesn't empty the torque convertor, I think only a full flush will remove 99% of the oil at a ZF specialist, but others will be able to confirm, as they have more knowledge then me.
I did mine because I tow a caravan, but it could do with changing again to get rid of the bad oil.
hope that helps.
David
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