2017 Maintenance guide schedule

I was just scanning the book and had some questions. Under normal maintenance it appears they are suggesting never changing the diff, trans, or coolant? Under severe, diffs every 15k, trans every 30k, and I still don't see the coolant.

 

Ok, I found the coolant under 100k or 120 months. What about the belt too?

 

Some things, like coolant, power steering fluid and brake fluid lasts a long time.
Trans fluid lasts a long time. These fluids will easily go 100K. Belts will last a long time as long as they are properly tensioned and aligned.
Diff fluid, for me, lasts 50K or so. Everyone has their own opinion on that though.

You are going to hear 1000 opinions, as long as you change it in some realistic time frame with the OEM or equivalent, you will be fine.

Posters smarter than Toyota engineers in 3.....2.....1.