Wynn's HPLS Manual Gearbox Treatment (part number SP59405) is a high-performance lubricant supplement designed to enhance the operation of manual gearboxes and differentials. This 125ml treatment improves shifting ease, significantly reduces wear on components, and lowers operational noise. It provides robust protection against rust and corrosion, extending the lifespan of transmission parts. The formula is compatible with all mineral and synthetic gear oils, meeting both GL-4 and GL-5 specifications, making it a versatile solution for various machinery applications.