[Kracka]

ATE is good for 3 years for normal daily-driving. For street and autocross use I would bleed annually, flush every other. If you're going to be doing track days I would flush annually. It's one of the longest lasting performance fluids out there which is a good thing. Motul, for example, needs to be flushed every 6 months due to it's highly hygroscopic properties no matter usage.