A lot depends upon where you live. Where we live (near Seattle) we have to treat our wood products with water staving treatments, and protect against mold. People in AZ have to prevent drying.

I’d recommend going to a place like Lowe’s or Home Depot and talk to an ‘expert’ who knows oak, and products for your area.
You’ll want to avoid linseed oil based products if you can, so look for stuff with cedar or tung oil.

“Ranger”