after 2 tanks of gas should have been enough to break it in, and therefore very little shavings from here on out... i dont know when to change it next really... i figure you there is no such thing as too fresh oil but at the same time its gets expensive if you do it every 2 hours haha
When I got my engine mods done. The machine shop said to change it every 15 hours( I bought a hour meter), but srew that. It would cost to much money, I am going to do mine around every 25 hours. When mine was stock I only changed the oil 3 times a year at the most. It also depends on how you ride your warrior,is it stock, and what conditions you ride in. Also I use 20w-50 yamahalube, but eveyone has there own oil they like.