Penetrating Oil is a low-viscosity oil that is useful to help free rusted parts, such as nuts on a bolt, to aid in removal. The name comes from the oil being able to penetrate into the narrow space between screw or bolt threads. You can purchase the commercial version at any hardware store, but you can make your own in a pinch if you have access to acetone and automatic transmission fluid made from dextron/mercron. More »
