A new heavy-duty lubricant, Amsoil Synthetic Fifth-Wheel Grease, provides protection against wear and corrosion while withstanding high loads and pressures, according to the manufacturer. Engineered to provide protection and performance in all weather conditions and in harsh operating environments, the company notes, the new synthetic grease resists water washout. Amsoil Synthetic Fifth-Wheel Grease is available in a squeeze tube for ease of application.