Are we starting this dicussion again ??....here is i think everything you need from the best expert in this forum
http://www.xoutpost.com/bmw-sav-foru...2-4-4i-21.html

Personnaly i did it as at same mile of yours with no regrets...Reco: go to shop transmission specialist

Take care

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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