It would take some other modifications, the mounts are different, and at the least you would also have to swap the seats.
Different people will tell you different things about oil, but any kind of oil for a 4 stroke atv or motorcycle should work fine, 10w40 in the colder months, 20w50 in the warmer ones. I use Valvoline 4 stroke oil, it's about the most affordable out there at $3.19 a quart, and so far it works fine. Just don't use oil for cars, it'll ruin the wet clutch.