In regular "D" mode, I find the auto trans likes to stay at very low rpm's when driving "gently". I leave mine in "DS" mode a good part of the time to keep the revs up a little more and let the engine exercise a bit. I'm coming from 12 years of driving manuals and typically, driving a manual keeps the engine at higher revs, this is not necessarily a bad thing during break-in. You don't want to never let the engine breathe a little and get to 4500 rpm a few times.

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2011 535i AT | Black Sapphire/Cinnamon | Premium | Heated Sts | Nav | Sirius | Anthracite Hdr & Trim
Prior: 2008 335i 6MT Sedan | Black Sapphire/Terra Leather | Premium | Cold | CA | OEM Alarm
Prior: 2005 330i 6MT | Black Sapphire/Sand Leather | Premium | Cold | UGO | OEM Alarm