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because the engine has to warm up to 210 degrees before it runs with optimum fuel economy. If it is a diesel it will take even longer because diesels have a higher degree of fuel efficiency, less of the energy in the fuel is wasted as heat, and more of it turns into meckahical energy. when diesel is put under pressure in the combustion chamber it explodes. It usually only takes 15 minutes or less. but if it is a big engine it may take longer.

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Q: Why does your car take long to warm up?
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