Is fretboard oil necessary

For that, many manufacturers recommend every six months you should clean your fretboard with a specialty wood oil. ... You don't need to apply much — you can put the oil on a cloth (not too much, just a bit), and then use the damp cloth to wipe your fretboard.

1. Can I use essential oil on my fretboard?

Can I use essential oil on my fretboard?

Pure, full-strength lemon oil, cold-pressed directly from lemon peel, is indeed bad for your guitar's fretboard. You'll sometimes see it labeled as “essential oil.” It's intense stuff.