Hello together I bought a 2Tact scooter from an acquaintance. He has overtaken it again from someone else, and the scooter. Except the engine, everything was apart. As far as good. 23000 km, the sweetheart ran. But now I don’t know what kind of oil should be tipped in the best way? There was a red one in it then, so my acquaintance put mineral in the tank. I think, however, that smells quite nice and would like to switch to partly synthetic oil. Can I just do that? If the owner of Ersr has only driven minerally, can oil coal dissolve there? How to proceed now best?