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Congrats on the car, its always a big day. I would and did follow the BMW break in procedure, its very simple and generally the folks that build the cars know what is best. Avoiding the constant speed is a challenge at times but as long as your varying the RPM you should be fine. I drove mine on several extended highway trips (2 hours or so) and just varied my speed and gears to keep from running the car at a constant RPM for too long. Stayed under 4,500 rpms which is pretty easy to do actually because the car had good torque. Having said all of that BMW does run their cars at the Performance Center without following their own break-in procedure, of course they are selling those cars after a few months without a warranty so take that for what it is. When I did my 2 day M school I think the lowest mileage car was about 800 miles so they may do a shorter break-in.
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