When I first got mine I was gonna do the switch, but the more I thought about it I realized I have never kept a bike more than 15,000 miles. I guess what I am saying is I really don't see an advantage (maybe fuel eco) to synthetic oil over conventional ,in a motor that most riders will never take to 50,000 miles. In my truck its a different story but for me the added cost just isnt worth it. (just my 2 cents) 8)