It appears the "marketeers of motorcycle specific oil" have reeled in another fish Rotella T6 has the JASO endorsement on the container and the API Logo indicates it is "Non-Energy Conserving" which makes it safe for "wet clutch" applications. Diesels, by their very nature, create as much or more "shear stress" on oil, as any cycle engine, with shared wet clutch design, ever will
Logically speaking with the money saved, in not buying "motorcycle specific oil", you could buy some "Sleeping Pills" and sleep like a baby