Ecolubrium Antifreeze Red Long Life is a full concentrate 5year,* long life antifreeze / coolant, offering freeze protection to minus 37.5 degrees centigrade. This product is recommended for use in most modern cooling systems and is safe to use with alloy metals. This red long life antifreeze meets or exceeds the accompanying specifications . For best results it is best to drain and flush the cooling system before replacing with fresh antifreeze.