Realize I'm in Florida, and it's gonna be upper 80's, mid 90's all summer (HOT). While orienting me to the bike (December) the dealer told me to just run the Honda 10-30 until 600 miles, then to switch to 10-40 for the summer, and then I could switch back to 10-30 for the winter if I wanted, but he strongly recommended I run 10-40 during the summer. I just ordered a case of Castrol Power1, I'm of the opinion it's a perfectly acceptable oil. I do run Amsoil in in all my cars/trucks, and I'm running their small engine oil in my generators, lot splitters, mowers... but I read good things about this oil, so that's what I'm going with.