Usually a good 500 mile run would be a start for a break in. I didn't consider the dyno a 500 mile run.
Oh well, pressure check the coolent system and make sure it will hold 15 pounds for 24 hours.
Do a smear on the a glass lens and check it under a scope. You could just have a good quantity of metal in the
oil.
What has been the temperature differential in your area for say, the last three months. If it is hot and cold, you may have a little condensation, but not enough to make the
oil look like that.
Gas generally does not turn the
oil color. Unless you have some off-the-wall product in it.
Did you put anything in the oil when you changed it last?
Just some thoughts.