Silicone (dot 5) is nice for museum cars but doesn't act nicely under heat. Dot 3 has a high boiling point compared to ordinary dot 4 but degrades very quickly with moisture. Quicker than degradation of dot 4. For street cars I prefer dot 4, usually castrol LMA. For track use ATE BLUE or Gold, or fluid like Pentosin (called either dot 4 SUPER or DOT 5.1). This has a higher boiling point than ATE BLUE or Gold.
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