In many cases, furniture oil provides a great way to finish the surface of a wooden item. It offers a beautiful sheen, resistance against the elements, and a convenience factor that is second to none. Like any other tool, furniture oil isn’t suited for all situations. There are times when it’s worth using and times when it isn’t.
You should consider the current state of the wood. If it’s already painted or coated, you will not be able to use a furniture oil. This is because furniture oils must be able to penetrate into the wood, which they cannot do if some other finish is in the way.
On the other hand, unfinished wood is usually a bad idea. Unless you are talking about a cheap and temporary construction, any wooden furniture should have its surface treated in some way. You have several options for finishing but oil is probably one of the easiest. You simply rub it into the surface and let it do its work. Wherever you see a dry patch of wood, that’s where you need to apply more oil.