Store Wood oil.
Most oils harden because oxygen comes in. To keep the curing oils like the improved wood oil, the Danish oil and the hardwax oil I use empty wine bottles that I seal with the Vacu Vin. Store Wood oil. Simple, inexpensive and effective. An additional advantage is that you have a reason to have an occasional bottle of wine open. The oil remains just as long well in a bottle of Charette of the Aldi as in a Barolofles…. 🙂