| Look for linseed (boiled) oil or lemon oil.
Apply a decent amount directly to your fingerboard and rub it in with a cloth or paper towel; keep rubbing until it looks like the fingerboard has absorbed most of it. Leave the strings off overnight and if the fingerboard is saturated you will wind up with a few wet spots in the morning. Wipe those off with a clean paper towel, restring and you are ready to go.
It's important to keep your unfinished fingerboards moisturized like that so (A) they dont dry and/or shrink - and (B) so if you ever get a refret you don't lose chunks of wood when the luthier pulls your old frets out. If the fingerboard is really dry and the wood binds with the tang of the fret, you get wood putty around your new frets. Not good.
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Life is too short for bad tone.
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bassic maintenance 
