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An engine needs a thermostat in order to maintain a stable operating temperature. Because of thermal expansion, the fit between various engine components changes with temperature. Therefore, an engine is designed such that this fit between components is optimal at normal operating temperature. Also, the ECU in modern, fuel injected engines requires the engine to be sufficiently warm before closed loop mode can commence. Until then, it runs rich, which would waste gas and increase emissions if run this way for extended periods. And finally, if the oil does not reach a sufficiently high temperature during operation, contaminants such as unburned gasoline will build up rather than evaporating away and being burned off in the engine. This will decrease the ability of the oil to lubricate. For all these reasons, it is NOT recommended that the thermostat of an engine be removed in order to prevent overheating. If an engine is overheating, the actual cause of the overheating should be found and addressed.

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