No, don't use scented oils. They just pick up dust over time, which eventually turns into sticky black gunk and can lead to unnecessary refinishing.
Grados are finished with a water-based polyurethane. Cleaning them with a damp towel is all you need. If you must wax, use a quality beeswax-based polish. Briwax is my choice, but there are other excellent ones, including beeswax recipes you can make yourself.