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I don't know anyone, including shops, that do power flushes on transmissions. At shops the machines simply exchange the fluid under the power from the transmission... no more forceful than operating conditions.
For a neglected transmission there may be some truth to loosening deposits.
There most certainly is and it's why flushes are usually not recommended unless a transmission has been properly maintained.
FWIW, the procedure for changing the CVT fluid for the 1st generation was a flush using the cooler outlet to drain the old fluid while replenishing with new fluid through the filler tube.
I was getting oil change last week, and asked them for quote for CVT fluid change, and service person's reply was "unless I can prove that CVT fluid was changed every 60,000 miles, they will not change it. At best they can do some inspection only, and only if I sign a waiver they may consider changing the fluid."
My mistake I know...but about 10 to 15 years ago, transmission on Maxima and Camry went out weeks after getting transmission fluid flushed at quick lube places. After that, I had Corolla's transmission fluid changed by Toyota dealer, and that was fine for more than 5 years until son totaled the car in accidents.
Since I bought the used car, I have no easy way to know if the previous owner changed the tranny fluid at some point.
I just don't think it's good if I don't do anything.
I'm thinking, I should do gentle dump and refill perhaps once a year.
I know this is not fully replacing the fluid, but I also don't want to introduce sudden change.
Perhaps, gradual dump and refill will at least refresh the oil life while being gentle to finicky tranny.
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