Any non-painted FB should be oiled regularly -- irrespective of climate, but ABSOLUTELY in dry climates.
Includes all rosewoods, Pau Ferro, all Ebonies, Pink Ivory, in short every FB material that has not been spray finished.
Regards,
J
Hey J,
Here's an alternative view on fingerboards that I's be curious about your response on:
Oiling your fingerboard regular might keep it from drying out, but it's also saturating the wood on continual basis. What happens to wood that is wet? It gets soft. Perhaps not over ten years, but likely over 50. My guitar tech reports getting fingerboards that were oiled regularly on old guitars that he can simply scoop out the wood with his finger.
An alternative treatment is to use very dried out Minwax pastewax in very small amount on the board when you first get it and seal the fingerboard slightly from the elements. It also gives the board a slightly subtle sheen and harder feeling, which I prefer. I've been doing this the last ten years and people who've bought basses from me sometimes ask me why my boards are so nice looking.
What do you think? I'm guessing your not going to be keen on it, but I've had great results, including on my new Fodera with the BRW board.