What kind of oil should I use in my 04' Raptor. I will go with 10w30 but do guys go with Synthetic?

I use Mobil one in my 04' Superduty Diesel and my LS1 Trans AM, should I use it in my Raptor?

 

Im usin silkoline ATV 10w40 in mine non synthetic. and i will goto either amsoil synthetic or silkoline synthetic after i get more hours on it. I ran Amsoil for 5 years better than 1000 hours and took it apart and the cross hatching was still in the cylinder

 

go with the synthetic , it makes the bike run better '' so i hear '', i don't use it because i don't have to much money to buy it, but a friend of mine uses it in his ds and it rruns great with the synthetic oil !!