My factory fill oil had a greenish hue to it when I picked it up with 6 miles on the clock, it didn't look like normal oil. It now has a black hue to it now with 3,300 miles on it. Indicating that the possibility of whatever additive may be in the factory fill is being depleted. When I change out the factory fill at 5,000 miles I intend to send a sample to Blackstone, hoping they can give some insight into the factory fill oil, break-in and wear on both the motor and the oil.