I was given one of these as a wedding present. 15 years on I have just found it at the back of a cupboard!
The oil has a use-by-date of ten years ago. I don't want to use it with oil that smells bad, so do I:
a) buy some new oil and try it out (any recommendations for which one?)
b) try the old oil
c) sell it
Bear in mind that I don't normally use air fresheners as I don't like artificial smells but if someone tells me it's actually really nice I might give it a go -now have a teenager in the house so it does sometimes get a bit smelly!