Im running 20w50 in my 2005 gsxr1000. I had a cam chain tensioner go bad. I was gonna try the vr1 for a bandaid. Long story short I filled it up with vr1 and chain clatter was the same. I learned that factory tensioners are hydraulic and have a spring, they are know to fail. I replaced tensioner with a manual one. Cam chain nice and quiet, Im happy with the manual tensioner. Engine seems smooth with vr1. Anyone have any comments on vr1, such as clutch problems or anything in general about this oil. Oh ya its the silver bottle dino oil.