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I used 2/3 bottle of ATE flushing the clutch, as you only get a little out each time you swap fluid by pumping. For a flush, I like to run a little more through than necessary and an extra $20 isn't much considering how much it costs to maintain this car. My track car I just bleed it all the time so I only use 1/4 bottle or so each time, and over the course of a year it gets equivalent of a couple flushes.