If your engine is the ABC version....you better add a couple of ounces of castor oil to the cruel power.

And yes, that's pretty normal, but you'll see some colors more than others... Cool power oil is green... so green is what you see, and looks like the green dye is the only thing that remains on the engines using coolpower, while the oil dissapears .

I used to dye my fuel, and the color remained inside the engine. Other than that there is nothing to worry about.

Saludos,

Jorge