If you bought the VX already, make sure you change your profile.
and when you are refilling, if you don't run the vehicle, all the old fluid won't get out and you will have some old stuff left in it.
You can always take is somewhere and have them "flush" it. It is what I do. it doesn't change the filter, but it will get all the dirty fluid out. it takes 14 qts versus the 9 to dump and fill.