If the knife is a user, I don't worry about oil marking the metal.
A framelock can be hard to unlock when the metal to metal contact of titanium to steel galls. Take a pencil and scribble on the lockface to lubricate it. This should eliminate a lot of the stiffness.
The pivot action will break in pretty quickly. I disassemble and wipe down the parts with Tuff-Cloth. This cleans out any grit that might have collected in there.