Running hotter might lead to better results, but sure it all depends on how the engine would handle that overheating. Oil and fuel quality might also affect the results. Well, oil coking in the cylinder head is sure not worth the economy of running hotter.
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Originally Posted by Stubby79
Probably not good for emissions, though.
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NOx emissions do increase while running hotter. That's been the issue with FCA EcoDiesel engines during the DPF regen procedure, since the injection got leaner during that procedure in order to build-up enough heat to burn down the soot trapped into the DPF.