JLandry, your comments reminded of my 440 cu in '74 D200 Dodge. To half way get along with that truck in hot weather, we drained the antifreeze and ran straight water with a can of Mac's #13 (water pump lube, rust inhibitor) from Napa. Although the boiling point for a mix is higher, it is easier to take the heat out of water than a 50/50 mix. I most certainly am not recommending this for a Cummins because I don't have a clue!! Mark