Originally Posted by Wentwest
If it was my scooter I would not put anything in the oil but oil. Modern oils and synthetics will do a fine job of lubricating and cleaning up your engine. These are not engines that sludge up. If it's not showing signs of stuck rings, leave it alone. If you can't stand not trying something a little "Seafoam" in the gas is OK. Not too much. These are pretty simple, low performance 4 cycle engines that can't over rev. They are very durable. Don't over think it; ride it!
It can be used in oil, but as Wentwest said, there is not much point. I hope your scooter stops smoking, it's just not right.