Should I warm up my car in winter?

Concerns & risks

You were trying to be kind to your car on a freezing morning, so you started it and went back inside for ten minutes.

Long idling burns gas without going anywhere.

Causes & evidence

Modern engines generally warm up faster by driving gently. FuelEconomy.gov notes idling wastes fuel. Clear all windows before driving. See fuel economy basics.

What to do

1. Clear snow and ice from all windows and lights.
2. Drive gently for the first few minutes.
3. Never idle in a closed garage.

Common mistakes: Common mistakes: idling in a garage, even with the door open, which can build up carbon monoxide. Another mistake is driving off with a tiny peephole cleared in the windshield; clear all windows, mirrors, lights and the roof. Check tire pressure in cold snaps since it drops with temperature. Keep washer fluid rated for winter. If your car has a block heater or remote start, follow the manual's guidance.

Speed Man tip: Check your owner's manual for cold-weather advice.

Wrap-up: Short warmup is fine. Drive gently. Never idle in a garage.