You don't need very much to flush the system. I did some measurements last time I did mine and though I bought 32 fluid ounces I think that was excessive. You only need to flush about four ounces out of each rear caliper (be sure to do both bleed screws) and two out of each front plus another four for the clutch.
I have used Castrol GT4 LMA and Valvoline, both DOT4 fluids, to flush brakes. The fancy fluids are great, but unless you're tracking the car it's of little consequence - you just want a good fluid that does not absorb moisture well. I do it yearly (IMO, the longest interval you should run brake fluid). A Motive power bleeder makes the job much more pleasurable.
John
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