Lubricating an F Attachment Trombone Rotor Valve 

Didn’t ask for a life story, buddy

Same, if you're referring to a rotary valve trumpet. Piston valve instruments need thinner oil though, so don't put piston oil on the trombone.

Correction, what I've said applies to the spindles, but if you want to oil the face of the valve, use a lighter oil, like a piston oil, or just nothing at all. It's not absolutely necessary.

No, but the bearing oil lasts longer and the valve oil keeps it from dragging the sides