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FWIW: I once ran year-old (but freshly bled) fluid at a track day and had some pretty serious fade. Now I'm always on freshly flushed fluid. It's so cheap to just throw in fresh DOT4 (i.e. from a sealed bottle) right before a track weekend that it doesn't make sense not to.
When running more expensive fluid (e.g. RBF 660) I still replace my fluid at least twice per year.
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