Personally, I flush my clutch fluid every other oil change (6000-10000 based on most people’s maintenance schedule). My suggestion is always sooner the more spirited the driving. I would also add to keep an eye on fluid color in addition to fluid capacity. If that stuff is dark brown or has crap sitting in the bottom of the reservoir, change it out! May not need to flush at that instant, but putting some new fluid in the reservoir helps, IMO.
As for how soon I would change the actual CSC, if I were in your shoes I would get it swapped out ASAP.
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'16 Pearl White Sport | Stillen Gen. 3 | Motordyne ART | Motordyne Shockwave | ZSpeed | Powertrix | EVO-R | Aeroworkz | Nismo | Z1 | EcuTek | Tuned by Seb @ SpecialtyZ
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