Lives in Los Angeles, CA · Featured on BBCAuthor has 33.5K answers and 210.6M answer views · Updated 10y ·
When I first learned to drive, I was taught the same thing (we're probably in the same generation).
In older cars, carbureted engines absolutely need a warm-up, because they are designed with a constant air-fuel ratio. If the engine was not warm enough, older engines would tend to stall.
The vast majority of new cars use a fuel injection system. They don't have that problem, as on board computers are able to change the settings to the required ratio, based on ambient air temperature.
Idling a car is probably the least effective way to warm it up. It only serves to waste gasoline.
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