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I've done the same thing in the past but don't plan to with my N63TU3. Lowering the operating temperature would reduce the expansion of piston rings, which could reduce their sealing ability. After that, water that blows past the rings into the engine oil won't evaporate as quickly at lower temperatures. Besides these obvious concerns, our engines in general are calibrated so precisely that there could be other unanticipated consequences of never letting the engine reach "full" operating temperature.
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