Wm Watt writes:

linseed (flaxseed) is the oil in oil-based paints and varnishes. it is
often used by itslef (boiled linseed oil) diluted 50% with kerosene or
paint thinner so it will soak into the wood grain. It costs less than
paint or varnish. I use it that way alone on the inside or as a
primer-sealer on the outside before painting or varnishing.

You've just described "teak oil" (diluted linseed oil).