Engine coolant replacement

I have a 2006 Toyota Matrix with 40,000 miles on it. According to the maintenance schedule I shouldn’t have to replace the coolant til 100,000 miles or 120 months. Does this sound right? I know it’s factory super long life coolant, but it seems like too long of a interval. Any thoughts?

Modern cars and modern coolants are different than what grandpa had. Not all cars call for the longer schedule, but if you hare one that does and IF you use the correct coolant, it should be fine for 100,000. Half the world does not bother the change it until the car stops running anyway.

If the factory maintenance schedule says 100K miles or 120 months, then that’s when you should replace the coolant.

You CAN replace it sooner if you want to, but you don’t have to.

I also have an '06 Matrix. I plan to change the coolant at half that interval.
Just a drain and fill, no flush.
Note that the manual recommends half the initial interval after the first change. Next spring (60 months old) mine will have ~21,000 miles if my driving habits don’t change.
I’ll also change the thermostat.