Engine Ice 1/2 Gallon Engine Ice Hi-Performance Coolant is biodegradable, phosphate free & non-toxic; typically reduces operating race temperatures and effectively keeping boil over temperatures to 256F or less and freeze-up protection to -26 F. Right out of the bottle Engine Ice Hi-Performance Coolant ready to provide you with dependable horsepower and is proven to reduce operating temperatures. They key to horsepower is not losing it! Engine Ice Hi-Performance Coolant is engineered to keep your operating temperatures at optimum performance to not lose power through excess heat.