Camellia oil is a Japanese, plant-based oil that was used by samurai to clean and preserve their weapons. It is used today as a natural, non-toxic corrosion preventative by blade smiths and wood workers.
Boiled linseed oil is used on the handle to keep the wood from drying out and splitting. Make sure to also apply it to the ends of the axe handle. Be careful with the rag used to apply the linseed oil. Oily rags can self-combust. Air them out to dry or put them in a bucket of water when done.
These oils should be applied to the blade and handle as needed.
Using Linseed Oil: