[Noah930]

I'd listen to whatever advice Fred gives, as he's the professional wrench. But the two Hondas I've had hold about 7 or 8 quarts of ATF, yet can only drain a little over 3 at a time. So to be anal about it, the procedure (short of a flush) is to drain-and-fill, drive around 15 minutes at least, and then repeat. Takes about 3 or 4 cycles to get fairly clean fluid. I mucked through the calculations, once, and it's something like 81% fresh fluid after 3 cycles, and 90-something after 4. The alternative to doing it like this all at once is to do just the 3 quarts every oil change or two. Both Honda products we've had have been known to have less than robust transmissions (though we've never had problems), so I erred on the side of more aggressive maintenance.