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These 8.3's are essentially a scaled up 5.9. What works for a 5.9 will work for these. What kills a 5.9 will kill these. Suboptimal running temps kill 5.9s, and reduce performance. A bit of an extrapolation, but the 6.7 (which is similar but not identical) suffers from carbon buildup on the...

Continually running a diesel engine below optimal temp will result in fuel dilution of the lubricant, wet stacking, and substantially reduced engine life....bad.

In the race world you see people putting higher temperature t-stat in place to increase running temperatures. And yes, you see cooler cans to chill fuel, and NOS to chill and oxygenate the fuel charge. But not to reduce running temps. internal combustion engines are heat engines. They extract...

More fuel for same amount of power = less efficiency, less complete combustion. Fuel condensation = diluted lubricant = reduced engine life. You don't want your motor to run cooler. What you want is greater cooling capacity to keep it from running too hot. When you're pulling the hill and...