The trucks are hot without a tune.
With a tune they are hotter.
You can bring those coolant numbers down about 10 degrees and stabilize the amount of fluctuating by adding Water Wetter to the radiator. 1 bottle.
Am I seriously saying that??? I did it on a whim months ago and it absolutely did the above.
Straight water cools better than anti-freeze. Water wetter just adds lubricants and corrosion inhibitors. Adding water wetter to anti-freeze is pointless. Running your engine on straight water off track is pointless.
Lastly, I have towed 10,000 pounds up 6% grades and nothing changed temperate wise. These engines aren't going to run hotter on a tune around town unless the cooling fan profile has changed.
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