I use Culpeper Essential Lemon Oil on The Dragon's Wing fretboard. For the value of the board (it's inlaid for the benefit of the new members in here) relative to the cost of the lemon oil and my time, I'm not taking any chances! The UK is very humid most of the time, but the wood gladly soaks up the lemon oil. It works a treat on my Westone fretless too, which hadn't been lemon oiled in 18 years but had never given any trouble either. It has benefited too.
I would say (for what this is worth) - you have nothing to lose by lemon oiling with a high quality oil, and everything to lose by NOT doing it.
Rog
P.S. The Culpeper Lemon Oil is 100% pure, made only from the peel of the fruit
www.culpeper.co.uk and search on product code 137238
(Message edited by rogertvr on February 25, 2005)