You should warm up your car for several minutes before driving
| You should warm up your car for several minutes before driving | |
|---|---|
| OUTDATED | |
| "In cold weather, you must let your car idle for five to ten minutes before driving to protect the engine." | |
| Domain | Consumer Products & Everyday Life |
| Tactic | False Context |
| Era | Historical |
| First seen | 20th century |
| Origin | Advice from the era of carbureted engines, still widely passed on |
| Last reviewed | 2026-10-29 |
| Further reading: books on Consumer Products & Everyday Life | |
The habit of warming up a car for several minutes made sense for older carbureted engines. Modern fuel-injected cars, standard in the US since the early 1990s, adjust their fuel mixture electronically. Most manufacturers and the US Department of Energy advise driving gently after about 30 seconds, because idling warms the engine slowly while wasting fuel.
The claim
Drivers are told that cold starts without long idling will damage the engine.
What the evidence shows
- Fuel injection. Sensors adjust the fuel-air mix for cold conditions, so long warm-ups are unnecessary.
- Gentle driving. The engine reaches operating temperature faster when driven moderately.
- Costs of idling. Idling wastes fuel, adds emissions and can leave fuel residue in the engine.
Sources
- US Department of Energy, Alternative Fuels Data Center, "Idle Reduction."
- Natural Resources Canada, "Idling Gets You Nowhere."