Auto experts today say that you should warm up the car no more than 30 seconds before you start driving in winter.
Article by Chris Mooney published on Dec. 29, 2014 on TheRecord.com
"We've all heard the idea: In winter, your car needs a little time to warm up before you can drive it. And that's why across Canada and the United States, people who live in cold and snowy places — and especially those whose cars have remote starters — often fire up their engines long before they start driving. Heck, they might even start the car from the kitchen in the morning, and only then start the coffee brewing.
But it turns out that this idea of idling your car during the winter is just wrong. (...)"