while taking the plastics off to clean the engien, i noticed the radiator fluid looked pretty, well, lets just it needs to be replaced. i went to a local shop and that had engine ice in 1/2 gal containers and water wetter in some little container (i guess i just add distilled water + that stuff). anywho, i was planning on going with the Engine ice, but how much do i need? i was going to get 2, but i wasnt sure if id need 3, or just 1. anyone have any input onto how much is needed?