Penetrating oils are specialized lubricants designed to seep into tight spaces and loosen rusted or stuck parts. They work by reducing friction and breaking down corrosion, making it easier to disassemble machinery or tools. Common applications include automotive repairs, household maintenance, and industrial machinery. These oils typically contain a blend of solvents and lubricants, allowing them to penetrate metal surfaces effectively. Popular brands include WD-40, Liquid Wrench, and PB Blaster. Users should apply the oil directly to the affected area and allow it to sit for a few minutes to maximize its effectiveness before attempting to move or remove the stuck component.