When I first got my bikes, I tried 3 brands of fully synthetic oil in them, based upon what was locally available. Any of the 3 would offer perfectly fine engine protection. Interestingly, each had a different effect on the ease of shifting. I finally settled on the one which shifted the way I liked, and have been happy for the past 70,000 miles. Based upon my experience, I would encourage you to try several until you find the one that works best for you. It may sound silly, but I also noticed that when I got a new pair of boots it affected my shifting until I got used to the different sensation of the thicker toe leather.