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I believe that at the local BMW dealerships they take the cars out to I-90 and 53 and run the on-ramps for 45 minutes then head south on 290 at WOT until the rings seat. Then they head to the tri-state to test the suspension. When they're all done they pee in the trunk, spray some air freshener in it and chuck it out on the lot. For the special order cars they do the whole prep process without any pants or underwear after a breakfast of 6 month old 7-11 breakfast burritos.
I work basically across the street from BMW North America, on Commerce in Schaumburg. I dont really know what they do there but I see them unload BMW's from enclosed trucks all the time. I see BMW's FLYING around all the time. maybe there testing them out, maybe this is the dealer prep. Who knows but it seems every hour or so I see another BMW fly past my window. I saw a few new M3's this week, three pretty nice.