How do you do oiling?
There are various types of wood oils which bring out the natural beauty of the wood and nourish it/stop it from drying out. You just brush it or roll it on using a roller designed for oil. A brush would be fine for small pieces. Europeans tend to go for linseed based oils, but I'd choose a hardwax oil. The wooden floors in our house are hardwaxed using this:
Fiddes Hardwax Oil. It's made in England but available in Poland. You can get it clear or tinted in various shades.
madrona.pl/srodki-do-podlog/olejowosk-fiddes-hard-wax-oil-250ml-detail