Many tracks disallow radiators to have glycol-based anti-freeze in them. (Because if they spew on the track, they are extremely slick and a major pain to clean up.) However, since I can go to track year-round, I'd rather not have straight water in there... anti-freeze down to at least 0'F would be good. Soooo, are there any non-glycol anti-freeze options? Or should I just plan to swap fluids twice a year?