The basic rule for anyone who's built engines, was to dump the first oil by 500 miles. That helps to get most of the crap out, including the assembly lube. I did the first change on my KR at about 600 miles, and then again at 2500. It looked dirty at that 2500 mile change. Won't hurt anything but your wallet by changing it often... This Motorcraft "full synthetic" is expensive stuff.
'08 Bullitt -Highland Green
'09 GT-500KR -Black/Black