I'm changing mine at 90,000km which is what the manual states for severe conditions, which I'm sure mine matches that description. That is 10,000km away for me, which is about the same distance away as your 100,000km mark. I'd be fairly sure that you reach that point before me, so let me know how it goes. I'm really starting to consider taking mine to Toyota for them to do it, but I'll see how I go.