Bought the 15w-50 for our two older Honda Shadow Spirit 750's. Shifting is now much smoother. The bikes run good with no noticable differences with the engines. California summers always reach well into the 100 to 110 degree range. This oil provides great protection. Will purchase again.
I have a 09 FZ1. Runs great in the bike. Everything seems to run smoother at higher temperatures. The only thing I was annoyed with was the spout on the bottle leaks a little when filling the bike but other than that I highly recommend this oil.