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How do you drive? Your engine might still not be broken in if you only drive in low rpm all the time. Use varying loads (redline pulls, downshifts, etc). I always shift around 3,000rpm minimum for normal driving because that is what Porsche manual states for all their sport engines (probably the best balance of performance and low engine load).
I would put nothing less than Castrol/M1 0w-40 for S55 that makes 150hp/L with huge turbines. 0w-40 was also the only correct engine oil upon the launch before BMW switched to a more fuel efficient and less protective 5w-30. Not sure how good the ravenol is.
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Pass me if you can.
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