Theyre cheap, their calipers are Brembo calipers iirc. RBF should be changed more often IMO than once a year. It gets watery really quickly and the pedal feel gets meh fast. I change mine every 6 months or so. Ate is $20 i think for 1 liter.
This should be a fun experiment then. In a perfect world I would of gone with Castrol SRF but that is just way too expensive. For those not familiar, Castrol SRF is much less hygroscopic and has an extremely high wet boiling point.
Edit: "However, being a silicon ester based fluid, Castrol SRF is actually less hygroscopic than conventional glycol ether borate ester brake fluids - it absorbs less water in a given period of time. Additionally, unlike conventional fluids, Castrol SRF actually reacts chemically (through a patent-protected process) with the absorbed water to reduce its adverse effects, preventing the high-temperature wet performance from deteriorating as rapidly as it would otherwise"
-From a thread on Bobisheoilguy