Myself I have always used Motul 7100 full synthetic which is overkill for a TDM engine design.
I popped cams out at 50,000 miles for shims and they were perfect, no signs of wear or any marks at all. So they must be well made and hardened properly ( Looking at you KTM)
Where motorcycle oils work hard is in the high shear areas in the gearbox, in between the gear teeth. All oils get sheared where the molecules break down and the oil loses viscosity. Regular changes are good.
I popped cams out at 50,000 miles for shims and they were perfect, no signs of wear or any marks at all. So they must be well made and hardened properly ( Looking at you KTM)
Where motorcycle oils work hard is in the high shear areas in the gearbox, in between the gear teeth. All oils get sheared where the molecules break down and the oil loses viscosity. Regular changes are good.