You didn’t specify whether it was a non-filter setup or a sealed and filtered setup w/blend or synthetic setup.
Any competent mechanic will tell that even with the sealed and synthetic setups - the fluid will not lost forever UNLESS forever means you intend to replace your car every 7-10 years.
If you intend to keep the car around longer...
The 15k or 30k rule applies...
=8-)
I just did a partial on my 2008 Tacoma Crew-Cab Short Bed at 40k. A tad late... For this vehicle - it amounts to about 1/3 of the total fluid capacity.
=8-)
Sealed filter, OEM Honda fluid, i.e. dealer did it.
I’ll change it a little sooner next time, 120K.
They are mostly highway miles and I don’t drive it much now that I work from home. It shifts smoother after the fluid change.
Speaking of fluid, the VTM has to be changed every 20K miles.
A pain in the @#$@#$
;)