A big +1 on Tru Oil.
You can find it anywhere gun supplies are sold.
I use that exclusively on my guitar necks.
It is not really an oil finish per say, it is a polymer varnish that gets hard when dry.
A very simple finish to apply, I just rub it in with my fingers.
I believe the heat from my fingers and the friction thin the oil just a bit and allow it to flow out well.
The secret to a great Tru Oil finish is to apply it in thin coats until the desired depth is achieved.
On my guitar necks that is usually around 6 coats.
On my Fender necks (rose wood fret boards) I do the Tru oil and let it dry a couple days then, steel wool it with 0000, then I spray nitro lacquer on the headstock and heel, so that it will age like lacquer does.
You can easily do three coats a day so in two days have all the oil on and by the fifth day be playing it.
I like to steel wool after about three coats to remove any bumps or lint, then wipe it down and continue with the coats.
A trick I learned was after you have all the coats on and it is hard, do your final light steel wooling then burnish the surface with a piece of old denim.
It will polish right up.
You can also wet sand and polish it just like lacquer if you give it about a week to cure before sanding.
THe small 3 oz bottle is enough for probably 20 necks.
Another trick is to take a tooth pick and poke a hole in the foil seal on top of the bottle and then you can drip out the amount you need.
Then when done, wipe off the top, screw the lid on and turn the bottle upside down.
That will prevent the oil from skinning over or drying on the surface when you turn it right side up.
My 2 cents
YMMV
