I agree about lemon oil being mainly detergent and fragrance, and linseed oil getting gummy--which is why I use neither...
I've always used Teak Oil; it's designed for marine use to protect the wood fixtures on boats from saltwater.
My logic is that saltwater and sweat are VERY similar, and very tough on raw wood.
The teak oil soaks into the surface and protects and toughens the wood, BUT you've gotta use it in moderation--I wipe on a VERY thin coat, give it a minute to soak, then wipe it off and buff the fretboard with a clean, DRY cloth.
This maintenance regime eventually stopped the seasonal "fret-sprout" that instrumets get here during Colorado winters when the relative humidity gets into the single digits...
Also +1 to the comments about how your hands enter the equation; I've bought used basses from people who had oily skin, and the fretboard was in good shape. But, I have ridiculously dry, cracking skin so I have to get oils into the fretboard from an external source.
I've always used Teak Oil; it's designed for marine use to protect the wood fixtures on boats from saltwater.
My logic is that saltwater and sweat are VERY similar, and very tough on raw wood.
The teak oil soaks into the surface and protects and toughens the wood, BUT you've gotta use it in moderation--I wipe on a VERY thin coat, give it a minute to soak, then wipe it off and buff the fretboard with a clean, DRY cloth.
This maintenance regime eventually stopped the seasonal "fret-sprout" that instrumets get here during Colorado winters when the relative humidity gets into the single digits...
Also +1 to the comments about how your hands enter the equation; I've bought used basses from people who had oily skin, and the fretboard was in good shape. But, I have ridiculously dry, cracking skin so I have to get oils into the fretboard from an external source.
