Hey, I'm planning on bleeding the brakes pretty soon and was wondering whats the best fluid you can get for street/track use. Last time I bought a bottle of valvoline super heavy duty dot 3 which wasn't too bad but I've heard people using dot 4 and 5 on there skylines. I was under the impression that you could only use whats specified on the brake master cylinder cap which says 'only use dot 3'. So is it safe to use dot 4 or 5?