I would use Amsoil break in oil; but I use Amsoil regularly...Do you have any way of knowing what the factory fill was? Here is an excerpt from the Amsoil site regarding their break in oil:
The primary goal during engine break-in is to seat the rings against the cylinder wall. Properly seated rings increase compression, resulting in maximum horsepower; they reduce oil consumption and prevent hot combustion gases from entering the crankcase. To achieve this, however, the oil must allow the correct level of “controlled wear” to occur between the cylinder wall/ring interface while maintaining wear protection on other critical engine parts. Insufficient break-in leaves behind peaks on the cylinder wall that prevent the rings from seating. The deeper valleys, meanwhile, allow excess oil to collect and burn during combustion, increasing oil consumption. Too much wear results in cylinder glazing due to peaks “rolling over” into the valleys and preventing oil from collecting and adequately lubricating the cylinder wall.
AMSOIL Break-In Oil’s friction-modifier-free formula allows the sharp peaks on newly honed cylinder walls (fig. 1) to partially flatten. The result produces more surface area for rings to seat against, allowing formation of a dynamic seal that increases compression, horsepower and torque (fig. 2).
Furthermore, the main objective in initial oil changes on a new vehicle is to facilitate the removal of harmful manufacturing and break-in debris for those interested in long engine life.
Mr. Jim Fitch, founder of Noria Corp. has authored a book "How to select an Oil and Filter for your Car or Truck" The above statement is from page 43. http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=How+to+select+an+oil+and+filter+for+your+car+or+truck
Table 13 on this same page Mr. Fitch outlines his RECOMMENDATIONS for the first few oil changes: 1st oil change within 100 miles of taking possession of the vehicle; 2nd oil change 1500 miles after 1st change, 3rd oil change 3K miles after 2nd, 4th and beyond at normal intervals. Go synthetic at 4th change.