As others have said before me, that first oil change showed a lot of aluminum specks in the filter (I didn't try to strain the oil to see, but there must be a bunch floating that the filter hasn't got yet). I put the filter in a jar of kerosene and sloshed it around, then strained the kero thru a paper towel, resulting in lots of alum specks clearly visible to the eye. Just think of the micro stuff the filter is not getting!! This was done at 500 miles. Wish I had done it sooner.