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F.D. Sako said:How do you plan on using the car?
If you're going to track it, definitely go with a DOT4 rated fluid. However, not all DOT4s are equal. Some have higher boiling points than others.
I use Castrol SRF, which has a pretty high wet boiling point (boiling point when fully saturated). I flush the system before the track season starts and then bleed it mid-season, which is about 3 track weekends.