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The oils seem extremely similar and would be comfortable running either one. The Redline 10w-60 used to be a bit thicker in the past and now looks pretty much in line with the others as the specs changed modestly ( I ran it a while back for about 7000 miles). If doing only track driving the Redline may be the best choice. If anything, the Shell specs indicate that 10w-60 is the right oil for this engine as BMW chose something extremely similar to the Castrol. I also think running Mobil 1 is fine for cooler climates, as even the Castrol (and probably Shell) break down to a 10w-50 over a few thousand miles. I'd be a little reluctant to use it on the track or with a raised (8600 rpm) limiter.
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