When should I change my Coolant?

Pretty sure there is no warranty replacing your tranny if the transmission life is less that what you hoped for. Back when I was growing up, when oil was still dinosaurs and plant life, a long life for a car was 100,000 miles. That was two transmissions. Or at least one and half of its replacement. When was this you ask? Mid-70s.

Swapping fluids in your garage is much cheaper that testing the dealer's theory and Toyota marketing.

 

I used to have some old automotive magazines from the late 50s. I remember reading an article about what vehicles may be like in the future.

Things like:

It may be possible in the future for a vehicle to travel up to a 100k miles before a major engine rebuild.

Disc brakes are not practical or cost effective on the average vehicle and will remain regulated to race cars and high performance European vehicles.

It's possible that some day all vehicles could be equipped with air conditioning

Future vehicles could have 4 and maybe 5 gears in their automatic transmission.

The list went on. Man have we come along way. You can put a 100k miles on a modern vehicle with nothing more than oil changes....and that's usually considered half life. Not to mention being able to walk away from most accidents that would have sent you to the ICU or six feet under in vehicles just a few decades ago