Most of the Brisbane/Aussie taxis with the Ford Falcon with the same transmission use the Nulon ATF. You can buy it in 20 litre containers from Supercheap. I have been doing the same with my X5 30sd. I did the first change with new pan and seals then followed up 5000km later with just a fluid only change. It is very smooth and the taxi operators change it at 100000km. I will only go for 60000km.