FYI,

Local NAPA store carries Pentosin CHF-11S for about $19/qt.
This is what I use.

Personally, from my research, Pentosin CHF-11S is a thinner ATF fluid and that is all. Many people use Mobil 1 ATF (in a system specified for Pentosin) w/o any issues at all. This is well documented in other BMW, Mercedes, Porsche, VW forums where people use Mobil 1 ATF instead of Pentosin.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT