I just took my 2014 Prius V to my personal mechanic for a 200k mile checkup. The vehicle looks and runs like it's still brand new! He changed the coolant in both coolant systems but was afraid to change the transmission fluid because of the traditional philosophy regarding standard gasoline vehicles that if a car has that many miles and the trans fluid has never been changed, don't change it or the new fluid can actually cause the transmission to fail. The logic is that a car with that many miles will likely have very dirty, black, and compromised fluid, and the added viscosity of the contaminants is keeping the transmission going. The mechanic at my local Toyota dealer was of the same opinion as my mechanic and several articles and videos I pulled off the Internet. The transmission on my Prius, however, is not the same as the transmission on a regular gasoline powered vehicle. My transmission fluid is still pink, only slightly discolored, and shows no sign of any contaminants. The fluid level was full, there are no signs of any leaks, and the transmission isn't giving me any problems. My inclination is to go ahead and change the fluid and add a quart of Lucas Transmission Additive to account for age. I am hoping to get another 100k+ miles out of this vehicle and can't see continuing to run it on the original transmission fluid. I am an Uber driver and drive about 65k miles per year. Can I get some other opinions about this? Thanks!