Special additives have been added to produce a long-lasting lubricant that has superior resistance to heat and protects from rust and excess metal on metal wear. These same high-pressure additives give Ultima-Lube Action Oil special adhesive properties that ensure it adheres well to metal surfaces without adding excess drag like heavy greases. Because of its high heat resistance, Ultima-Lube Action Oil can be used for high-volume applications like full-auto, suppressed or high round count competition firearms with little loss in performance at over 400 degrees. High heat resistance ideal for high friction, high round count firearms Special Additives protect from rust, wear and enhance adhesion to metal Ideal viscosity for all types of firearms Protects and lubricates from -40 degrees to 425 degrees NOTE: Ultima-Lube Action Oil may be red or blue in color depending on when it was packaged. The oil itself is the same, only the color is different.