My WRX has about 8000 miles on it, in two weeks I'll be heading to NHMS for a track day. After all is said and done I was contemplating swapping the transmission fluid, oil and maybe brake fluid and rotating my tires. Is this a piratical course of action? I was reading up on the performance of the WRX and track days apparently take a bit of a toll on the car; I don't plan on pushing much harder than 85-90% and I'd rather not leave dirty tranny fluid in the car for another 20 000 miles. Opinions are welcome.