Just as title says; changed it this past weekend and the bike is definitely slower, less responsive and choppy when shifting. Power wheelies in 1st gear require starting from a higher RPM or more throttle. When I had 10-40 in my bike it rev'd higher and with ease than the 15-50. Anyone else experience this when changing to a different oil? Every change has been with Mobil 1.... oh well. Using up what I have left then going back to 10-40.