I have not tried engine ice, but I have used Water Wetter with good results. I used to race a military jeep with a rotary engine in it and it used to run very hot at high rpm. After improving the shrouding, enlarging the radiator increasing the air flow path, I finally tried the Water Wetter, apparently it has a chemical that helps transfer the heat out of the aluminum and into the coolant . This did greatly improve the cooling, and I am not a fan of magic potions. But in all fairness, the real solution would have been to under drive the water pump . John