I'll be swapping out the tranny fluid in my 75K mile '06i here soon and I was wondering if any of you had suggestions as to what you normally used for the pan gasket. Is there a rubber/cork/fiber factory gasket or do you suggest RTV? Also, is the transmission filter available at local parts stores or only at the dealer? I've not decided on Mobile 1 ATF, Redline D4, or Amsoil ATF yet, but I'm obviously going the synthetic route. It'll depend on what's cheapest locally.