No oil
There is no telling what the original finish was. If that finish is not matched your "guessed material" application probably won't look good.
On raw stocks I use either marine spar varnish or pure Tung oil. Either way the last application is a high carnauba content past wax. Treewax was good. Now I use a product from "The real milk paint company" Very high in carnauba.
I also use it on all of the cast iron tables on my shop machinery every 6 months. Both for friction and rust control.
Any paste wax designed in the old days generally for household wood floors will work.