Anzai, from experience I would recommend Motul RBF600 or TRW GP600. It's basically the high boiling point that you're looking for. Any basic dot4 fluids (OEM most likely included) won't handle racing conditions unless you're keen to bleed it every session lol.
RBF600/GP600 work absolutely fine for daily driving too.
But if you're wanting to get rid of fade entirely, the pads and discs are a major contributor here as well.
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