AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/car-warm-up

It's 25°F outside. How long do you warm up a modern car?

About 30 seconds, then drive gently.

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The Just Right card

Too littleScrape a peephole in the frost and go
Too muchLet it idle 10 to 15 minutes
Just rightAbout 30 seconds, then drive gently

Huh, didn't know that: The engine warms up faster being driven than idling.

The dad joke
I couldn't figure out how my seatbelt worked. Then it just clicked.
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AhaBulb card: It's 25°F outside. How long do you warm up a modern car?

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References

Answer: About 30 seconds, then drive gently. Modern engines only need about 30 seconds. Driving gently warms the engine faster than idling, which just burns gas. But clear every window before you go.

  1. U.S. Department of Energy Energy Saver guide www.energy.gov/sites/default/files/2022-08/energy-saver-guide-2022.pdf
    Most manufacturers recommend driving off gently after about 30 seconds. The engine will warm up faster being driven
    Checked 2026-10-09.
  2. NHTSA winter driving tips www.nhtsa.gov/sites/nhtsa.gov/files/documents/winter-driving-tips.pdf
    Before driving your vehicle, clean snow, ice or dirt from the windows, the forward sensors, headlights, tail lights, backup camera and other sensors
    Checked 2026-10-09.

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