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The engine runs best when its coolant is about 200 degrees Fahrenheit (93 degrees Celsius). At this temperature: The combustion chamber is hot enough to completely vaporize the fuel, providing better combustion and reducing emissions. The oil used to lubricate the engine has a lower viscosity (it is thinner), so the engine parts move more freely and the engine wastes less power moving its own components around. Metal parts wear less. Most engine will run at between 200-220 degrees. The system is pressurized and the boiling point is higher under pressure.

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Q: What is the normal operating temp for 2004 Pontiac grand am?
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