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some Valvoline semi-synthetic ATF
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Good stuff. Keep it for now. Change annually with the same stuff. Been using it for the last 5 years/70k miles, 0 transmission rebuilds, 0 wheel bearings, one Duty Solenoid A, one jumped timing belt.
Definitely helped the wheel bearings :-)
If you just drain the ATF from the sump, you get of ATF 1/3 out.
If you drop the sump and pull a line that begs to be pulled,
you get another 1/3 of ATF out in an hour or so (drips slowly).
The flush is different from the drain because with flush they disconnect the cooler line, let the discharge line drain and feed the new ATF into return line to transmission. They promise to replace all ATF, but the catch is, you can't drain all old ATF first and fill new next, you can't leave running transmission empty. You have to actually supply new ATF while the old one is draining. The new and old ones mix in the process. Flush is more expensive then drain, but I'm not sure you achieve more than 2/3 of ATF replacement with it.