Are the instructions to use mineral based motor oil instead of the synthetics applicable to today's new BMW engines?

So on the day you take possession of your new E70 X5, you head to the nearest Jiffy Lube and ask for oil swap to Pennzoil dinosaur oil, drive like you stole it for 500-1500 miles, then go back to Jiffy Lube for a 8 shots of Mobil 1 or Syntec?

I'm being facetious. If this practice can be substantiated as being beneficial to today's high tech engines, I would do it, but I sure would like to see the pros and cons of it first.

Comments?