Warming up a car in winter can be helpful, but you don’t need to idle for long. A short pre-start warm-up and then gentle driving is generally the best approach for most modern vehicles. What to do

• Quick idle if needed: Let the engine run for about 15 seconds to allow oil circulation, especially in very cold temperatures. Avoid long idling sessions.
• Start driving gently: After the initial idle, begin driving at a light throttle and lower speeds for the first few minutes. This helps the engine and transmission reach operating temperature more efficiently than extended idling.
• Defrost and visibility: If windows are fogged or icy, use the defroster and warm cabin as needed. A quick blast of warm air can improve visibility and comfort without requiring prolonged idling.
• Monitor for any issues: If you have an older car, or it’s unusually difficult to start, a longer idle time might be a sign of an underlying problem (e.g., battery, spark plugs, or fuel system). In that case, consider a brief idle followed by smooth driving while you address the issue.

Tips by scenario

• Gasoline cars: Short idle (up to a minute) is sufficient in most cold conditions. Drive gently to bring the engine to operating temperature.
• Diesel engines: Diesel engines often benefit from a slightly longer warm-up in very cold weather, but still avoid long idling. Follow the vehicle’s manual.
• Electric vehicles: Preconditioning the cabin and battery (via the car’s app or built-in features) while plugged in is recommended to improve range and comfort; no engine warm-up is needed.

Safety and efficiency

• Excessive idling wastes fuel and increases emissions, without substantially warming the engine beyond what a brief idle plus gentle driving achieves.
• A clear view of the road is essential; use the defrost/defog functions to maintain visibility safely.

If you’d like, tell me your car’s make, model, and whether you’re dealing with extremely cold temperatures; I can tailor the warm-up advice to your specific vehicle.