I use linseed oil, mineral sprits for first coat or two with 1:1 ratio to penetrate the wood. could add stain color to maybe get some color into it.
other coats I add tru oil to the mix as a hardener and wipe access.
Wood is a great filter... adding solvents to non-curing linseed does not increase oil penetration and even if it did the result would be negative in every respect for the finish.