HD Expert 50/50 Pre-Diluted Maximum Service Life Heavy Duty Antifreeze/Coolant Endurance is OEM (Original Equipment Manufacturer) approved, designed for use in all newer on-road and off-road vehicle working in intense circumstances where high heat and aluminum protection is required. This antifreeze/coolant will provide superior protection against CAB flux 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 and product manufacturer’s guidelines regarding product dilution. HD Expert Endurance is compatible with all newer aluminum radiators found in today’s engine cooling systems.