A "renewable" finish used to enhance the richness and beauty of the wood grain. With time and repeated application, oil finishes can harden the wood to form a durable protective topcoat.
Oil finish, which protects the wood without an exterior coating, by sinking into the wood surface and hardening. The oil darkens the wood, increasing the grain contrast and appears to be a hand rubbed finish, without the labor.
Penetrating oil or penetrating fluid is very low viscosity oil. It can be used to free rusted mechanical parts (such as nuts and bolts) so that they can be removed, because it can penetrate into the narrow space between the threads of two parts. It can also be used as general purpose lubricant, or to clean or prevent corrosion.