Put some Lucas in it and see the result, LOL.?
Seriously now, this was already debated here. Search the forum for it.

Opinion differs from owner to owner.
I plan to service mine at 80k kms. The dealer should do the service upon request but say it`s unnecessary.
Gears are gears, clutches are clutches - they wear!

 

I had a 2016, did a drain and fill at 20k, fluid was almost completely black already. Probably gonna do a drain and fill on my 19 at 15k. Hope no one decides I should buy a new car again.

 

I had like 356k miles on my 2007 and never touched the trans oil. Didn’t have any issues with trans.

 

Good to hear it was a camry in sure mostly highway driving?

 

I commute 2 hours worth of highway driving a day for the 11 or so years I owned it. Only things other than brakes, tires, engine oil, that I remember doing was a TSB or so, one was for a software update for transmission shifting shortly after I bought it new. The week before trading it in the ac stopped blowing cold. Rear main seal dripped a bit too at the end. When it was time for a new car I really didn’t feel like getting another Camry, but it made the best sense so I did. I’m not sure how many other cars would have been as reliable. They gave $500 trade in lol. I didn’t end up buying extended warranty on the new 2018-I figure I won’t need it. I used synthetic engine oil the entire life of the 2007.

 

I did a poor mans flush a few times on my 05 camry 2.4L. The first was at 166k miles along with filter and pan cleanout(unknown if it was ever changed), then again a few more times. (All using Valvoline Maxlife Synthetic)
It has 305k miles on it now. Not sure about the longevity of the tranny because it has had a wierd 1st-2nd shift problem since I got it at 166k. (Valve body probably needs a sonnax zip kit)

But, it's still the original. (U250E)

 

174k on my 09 I bought new. So far so good. But, I really should have it changed and filter cleaned (permanent filter on this one).

 

Transmission isn't sealed. Its dipstickless since the IQ of the average owner in the last 50 years has dropped and doesn't know how to use a dipstick. It still has drain/fill plugs and a overflow tube for level checking when the ATF is at the proper temperature.

Driving style has much to do with transmission longevity. Maintenance helps but is not the end all.

 

Reading the dipstick correctly is the problem. Modern transmission fluid must be read at an exact temperature as determined by the manufacturer. Each manufacturer has their own temp range. In the old days you checked it when it was hot, and that was it. I think Toyota is 103 degrees is the temperature to check the fluid, not hotter or cooler. On my Ford truck it's 190 degrees. If you checked a Toyota at a Ford temperature it would read overfilled. Check a Ford at the Toyota's temperature it would read low. Best way to prevent that from happening is to remove the dipstick to keep the owner from tampering with the fluid. The transmission is filled by a computer at the factory to an exact amount by volume. And I know plenty of people who have high mileage vehicles and never changed the transmission fluid.

 

In the old days, there was a temperature requirement that all ignored. Hot was NEVER correct temp. This is why dipsticks are gone.

 

On the 6 and 8 speeds the fluid runs 20 degrees hotter in normal driving than the old 4 speeds and accumulates more wear debris because of all the extra gear shifting. So the fluid is already browish by 35,000 miles and is black and starting to get sludgy by 100-125,000 miles. So I drain & refill the pan 3 times in quick succession it every 30,000 miles to change out a majority of the old fluid by 125,000 miles