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Originally Posted by yangin
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RBF660 is Motul's ultra-high performance fluid for the track. It will work on the street but it's overkill. It's longevity is probably limited and you will likely end needing to flush much more frequently compared to something like BMW DOT 4.
It will all depend on what you're using the car for. For street driving the OEM DOT 4 is fine. Next step up is something like ATE Type 200. If you need more heat-resistance for the track then RBF600 is a logical next step. Or, as Lutfy says, just flush once with SRF and be done with it until the next year.