What kind of oil do you like to run in polaris snowmobiles?

[__A_YAHOO_USER__]

What kind of oil do you like to run in polaris snowmobiles?
i got a 2000 polaris RMK 600 (not ves) and wondering what kind of oil people like to run in them things...better for cheaper if possible? amsoil,polaris blue....?

 

[CLAYTONM]

5w-30 quaker and hot it keeps my legs warm