Modern lubricants flow well in cold weather, and do their job better than their previous formulas. Modern engines are also made to much tighter tolerances. Fuel injection has eliminated the choke and the need for a warm manifold.
You'll get better mileage if you only warm up the car for 30 seconds or so. The car will warm up faster with gentle driving for 5-10 minutes than it would idling for the same amount of time. Gentle driving will also warm up your brakes, preventing warped rotors, etc. that can be caused by an abrupt stop with cold brakes.
by chuckbalog on August 17 2008
this tip works for 94% of voting Fuelly members.