No oil in the FP. You do not want to put anything in there that will attract powder, dirt, debris and make it stick there. Even with a murray's FP. I just put one in my SKS and it still got gunked up. First time shooting with it yesterday and I thought I had f*cked it up but it turned out to be popped primer debris got in the FP chamber. It actually caused the FP to stick forward enough to cause light strikes on the primers. No slamfire though. Found little bits of metal stuck in there when I took it home and disassembled it. Good thing Murray sends you a couple extra springs with every FP cuz the first one was bent after that.
Sensible amount of Hoppe's #9 or Rem Oil everywhere else. IE:all moving parts and wipe with a light coating. Complete clean after shooting corrosive ammo. I find the rem oil is handy when cleaning. Spray it on and wipe it off. Brake cleaner works great on the bolt assembly, but mine is shiny, might not be good on the painted ones.
Common sense applies here, if you shoot alot at once or often, oil your gun its good for it cuz its metal. Just thoroughly clean the crud off it right after or it will rust. Works for me.