A good brand of Dot 3 is all you need, but plan on changing it every two to three years...depending on the humidity in your area. Dot 4 is synthetic but not silicon and can be used.

Dot 5 is silicon and cannot be used. The ABS valves & solenoids will aerate silicon and the pump may not get proper lubrication with silicon based fluid.

Thanks to members of the AACA Reatta forum for this information.
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