HD Expert 50/50 Pre-Diluted Extended Life Heavy Duty Antifreeze/Coolant Extreme is designed for use in modern on-road, off-road, farm & marine engines working in the most extreme conditions. This antifreeze/coolant will provide superior protection against rust and corrosion for all coolant system metals, including aluminum, while providing extended protection against wet sleeve liner cavitation pitting and extreme temperature variations ranging from -37°C to 129°C, preventing summer overheating and winter freezing, when used in accordance with OEM (Original Equipment Manufacturer) and product manufacturer’s guidelines regarding product dilution. HD Expert Extreme is compatible with all newer aluminum radiators found in today’s engine cooling systems.