All modern BMWs use DOT-4 brake fluid. Sometimes it is hard to find, or you will only find DOT-3/DOT-4 synthetic. I bought some Pentosin (German) brand DOT-4 ("Super 4) at an auto parts store that caters to foreign cars. I paid $16 for a 1L can and a 1/2L can.
A lot of people also use ATE brand either ATE super-blue or ATE200 (gold colored).
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