Interesting. I literally just changed it right _before_ adding the fuel system cleaner. I had my 5,000 mile service, brought it home, drove it about 30 miles until the lights came on, added enough gas to get it to half a tank, then added the fuel injector cleaner. Still think I think I should swap the oil based on a brand new oil service?
I'd look at it. If it's black I'd want to change it. Maybe wait until after you do the second treatment or decide not to.