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0W-50 is still thinner than 15W-50 (or worse yet 10W-60), it's a significant difference.
BMWs call to run 10W-60 with extremely tight bearing clearances in the M3 is off the rails insane, and I'm not the only one who thinks that...hope you are babying the heck out of the engine until it's completely up to temp (i.e. oil temp gauge). I would be running 0W-40. Modern synthetics are so good that viscosity loss isn't the problem it once was (assuming fuel dilution is in check, which can be a problem for boosted applications). You may want to get a used oil analysis for viscosity and wear metals
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