3. Til that its actually bad for your car to let it sit and idle to warm up. Only a...

Til that its actually bad for your car to let it sit and idle to warm up. Only a couple seconds is needed to allow the oil pressure to build up.

The life of components like piston rings and cylinder liners can be significantly reduced by gasoline washing away the lubricating oil, not to mention the extra fuel that is used while the engine runs rich. Driving your car is the fastest way to warm the engine up to 40 degrees so it switches back to a normal fuel to air ratio. Even though warm air generated by the heater core will flow into the cabin after a few minutes, idling does surprisingly little to warm the actual engine. The best thing to do is start the car, take a minute to knock the ice off your windows, and get going. The obvious caveat here is that if it's below freezing, you need to make sure your defroster is working before you go tearing out of your driveway. Don't be the person peering through a porthole in your ice-covered windshield. Some cars, like certain Land Rovers, expedite this process with electric heating elements in the windshield

/r/todayilearned Thread Link - popularmechanics.com
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