Multi-purpose oils are versatile lubricants designed for various applications, including household and automotive use. They can reduce friction, prevent rust, and provide moisture protection for tools, machinery, and surfaces. Commonly found in spray or liquid form, these oils are easy to apply and can help maintain the longevity of equipment. These oils often contain additives that enhance their performance, making them suitable for tasks like lubricating squeaky hinges, protecting metal surfaces, and even cleaning grime. Popular brands include WD-40 and 3-IN-ONE, which are widely recognized for their effectiveness in both home and industrial settings.