On my 2nd CBR the first did 240,000km before needing a set of rings.
The one I have now a 2006 purchased with 32,000 now at 45,000 have always run Shell helix ultra (fully synthetic).
OCI is 8,000 most of my riding is highway work as I'm not a fan of riding in the city.
Adl to Alice, Adl to...