Help: Sterling SBMM SUB SILO 3, neck question

I have a SILO3 and the neck is very smooth. But it is light and pale. I want to darken it up a bit. Does the Silo3 have a finish on it of any kind? It doesn’t seem like it to me. I am wondering if I can stain it or put some tru oil on it to darken it up a little bit. Other than that the asymmetrical shape is comfy, just takes some getting used to. Frets are great.

Thanks, Luc