Dextron isn't something that power steering fluid contains.
A) Isn't power steering fluid, its ATF. (Automatic Transmission fluid)
B) Is a certification of ATF. Get Dextron III if your bmw says ATF on the steering reservoir cap. CT has it.
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Hot: 2001 Estoril M RoadsterZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's michelin supersports, deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black, ohlins, pazzo, graves