Contact a local woodworker or furniture maker. I think you are looking for a wax instead of an oil. It sounds like you have a spot where the finish has worn off. That is why the spot does not match the rest of the plinth.
You need to find out what the top finish had on it that has worn away. Was it dull or shiny? Clear-coat, varnish?? (maybe a wax or a sealant of some kind, urethane or polyurethane)? JAWAG!
You need to find out what the top finish had on it that has worn away. Was it dull or shiny? Clear-coat, varnish?? (maybe a wax or a sealant of some kind, urethane or polyurethane)? JAWAG!