Oiling a double bass

[Beedster]

Folks, I bought an new but unfinished 4/4 body/neck from a German firm in 2015, I built it up and have been gigging it since then and am thinking it's about time I applied a finish. I want to oil not varnish, what's the best bet?

[Beedster]

I'd quite like to keep it blonde by the way  

[JPJ]

Most of the oils I’ve used have the effect of darkening the wood (tung oil, tru-oil, gunstock oil), would shellac not be a better option?