Alex, in the manuals I got with my new XC, the full maintenance schedule is in a separate warranty and maintence book. That may be what you need to determine the ATF changeover schedule. If you don't have that, you may be able to access it on line. Go to Volvo's official website, to the Owner's Circle. Register. There will be fields to identify you year and model. Once that was done in my case, I had access to the full maintenance schedule on line. Try that to at least see if it gives you more detail than the operation manual.