Good news: Viscosity is not important, because outer oil does not create damping, inner oil does.
Bad news: Bumpy roads and gas FGR-s don't play toghether well. It's like farmer wearing tuxedo. Extremely expensive service and extremely short service interval. But how much performance is left when not serviced in time, I don't know.
Race Gen4: K-teck DDS, OhlinsGP+link, RCS17+T-Drive, CordonaQS, Kit ECU+PC5, MivvFull, ported, milled, light crank, race in. cam, BMCrace.
Suzuki GSX1300R Hayabusa 2013
Kawasaki KX450F 2016