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Not a good idea to lower engine operating temperature. There is no choke on a fuel injected engine --- the ECM looks at engine temperature by means of the signal sent by the temp sensor and compensates for lack of vaporization (cold engine) by lengthening the pulse width of the fuel injectors.

The net result provides an abnormally rich fuel mixture just as a choke would. As the engine temp increases and vaporization improves the pulse width is decreased gradually until the engine reaches full operating temp. Lowering the peak operating temperature would create an overly rich fuel mixture all of the time and fuel economy would suffer. Another possibility would be that a portion of the excess fuel in the cylinders could get by the rings and end up in the crankcase, contaminating your oil with gasoline.
 
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