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引用曼省的Driver's Handbook 里面是这么说：
Use a block heater in the winter to warm the engine oil and make cold starts easier on your engine parts.Your vehicle's oil does not freeze when the temperature dips below 0'c,but it does get much thicker.This means your engine has to work harder and use more fuel.Use a timer to switch the block heater on two hours before you plan to drive.Proper use of a block heater can improve your vehicle's overall fuel economy by as much as 10%.Don't leave your block heater on overnight or your energy saving will disappear in a higher electricity bill. |
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