I am running Mystic full synthetic in my 09 Crossfire 800 and my power valves are cleaner using it than when I used Arctic Cat APV oil. No other issues either. The cost is why I use this oil.
Im riding a 84 john deere trail fire this year and its been burning the organic blend pennzoil. I suggest it to every one that cares about the environment more than there sled. It pours in black but the smoke is a greyish brown with a scent that would leave any true sled head in a state of pure disgust.
If you care so much for the environment buy a four stroke...live and let ride.