RBF600 is DOT 4 compatible, and perfectly fine for all year street use. It's also a very popular track day fluid, and we run it in our track cars. As a habit, we give the system a quick bleed before each weekend's track event.
Brake fluid life, and bleeding requirments are directly related to how hard you brake, how much heat you are putting into the system, and the type of track. Is the track brutal on brakes, such as a short track, with a ton of turns, and short straights? Or is it a sweeping high speed track, with just a few stabs of the brakes?
Loosing your brakes on track, is one of the most dangerous things you can experience. Hence, a quick bleed before each track day is a prudent and inexpensive safety measure, IMHO.
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