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What I have done with my other Subaru WRX is a drain and fill, once a year or once every 10K miles. Rather than try to get every bit out by doing it three times at once, it adds better fluid every year or so. Worked for 116K so far with no issues. I may do the same with the BRZ, depends how much effort I want to make. I drive the WRX pretty spirited and the fluid coming out always looks great. I am sure its overkill, but can't be bothered to do it three times in a row. I wish there was a better way.
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