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I used to run Prestone synthetic in my spec Miata and gutted e30 track car and flushed them between every event. Once you're on the closer side of 1.5 tons or have a car with inadequate brakes you may end up boiling lesser fluids and in turn ruining your later sessions. The S2K is notoriously under-braked for it's abilities on track.
I'm lazy now so I'm running srf without touching the brakes for 12-15 months. 😯😛 Can't beat the wet/dry performance.. and if your car is 3000lbs or your track has some +120mph straights it's one less weak point to worry about. $0.02
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