The Motorcraft XL-3 Ford rear axle additive friction modifier is a 4 oz. bottle of specialized lubricant designed to improve the performance of rear axles in Ford vehicles. Made by the trusted brand Motorcraft, this additive is specifically formulated to enhance the viscosity of the oil and reduce friction for improved gear performance. This product is a pack of 1 and is proudly made in the United States, ensuring quality and compatibility with Ford vehicles.