you might benefit from lighter oil, it was night and day when I used 20w in mine. I've got a Z1 now, was less noticeable when using lighter oil.
but would it void warranty?
Not sure, but I doubt they’re going to check your viscosity at the service centre.
@amey started
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you might benefit from lighter oil, it was night and day when I used 20w in mine. I've got a Z1 now, was less noticeable when using lighter oil.