Indeed, these are the little filters you see at the auto parts stores, called
crankcase filters.
Also, I use a catch can on our 6.1L Hemi and it catches a hole lot of blow-back oil/sludge. It is a very nice quality piece that is very easy to empty as the bottom section unscrews. made by Billet Technology... I was thinking of getting these for my 370z, but getting 2 seemed expensive.
By the way, a note for California cars... both these crankcase filters and catch-cans do NOT pass SMOG (visual insp.).