Ok, bcause they (transmission shop) changed 16 liters on my 4.4 with torque convertor and cost associated (similar than yours) but with Wynn's oil ..versus a lot of folks here doing DIY with 5 or 6 liters ?? ...my tranny works very good since the changed at 70k miles....here is more from that thread :
http://www.xoutpost.com/bmw-sav-foru...2-4-4i-21.html

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2006 X5 4.4i premium, Sport package ,Winter Package, Sat Nav. AFE Power stage II Production : 08-2006
2012 BMW 128I Convertible Black
2011 Mercedes Benz B200 sold