CRC 5.56 Multi Purpose Lubricant 20 Litre 5009CRC 5. 56 is a multi purpose product with superior penetrating power that breaks through rust and corrosion while it clears away scale and dirt. Eliminates the need for many disassembly operations. Lubricates for smooth action, and silences annoying squeaks and squeals. Protects metals against corrosion and displaces moisture to help start wet engines.