I use the best oil on the market... Royal Purple. Hands down in my humble opinion the best oil there is. There is another one I cant think of right off hand that is good as well. But I strongly recommend Royal Purple. Good luck
2006 Red Brute Force 750, FST Trail kit, STG III cams, Full Muzzy, Dynatek CDI, Works G series Shocks, Venom 2000lb winch, Duro Powergrips w/ITP 108ss rims, Oil Cooler, Engine Ice, HDPE skids from Chuck, some homemade clutch snorkels, EHS lid, K&N filter, ODI handgrips.