There's an oil thread on this forum where a few people have stated their preference for oil. I always go to full synthetic at the first oil change. I buy Rotella T6 from Walmart. Sells for about $23 a gallon. There is also a $5 rebate until the end of May, so that makes the oil cheaper than lots of conventional oil. It's diesel oil, but the specs indicate it will work fine for motorcycles. It has a JASO MA rating...meaning it won't allow the motorcycle clutch to slip the way many car/truck oils can. Lots of people have been using Rotella T6 for years in their motorcycles, including me.