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FM Booster is only needed if you hear grinding when doing very tight, low speed turns. Most cars (Z4M's) do not need it. Some do. There is a SIB on this.
I take a CLEAN one gal. jug (I sourced from my local Granger store) to my dealer and he puts two pints of SAF-XJ in the jug.
Castrol SAF-XJ PN # 83 22 1 467 993 (expensive)
Castrol SAF-XJ + FM PN # 83 22 2 282 583 (really expensive)
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