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Old 13th November 2009, 12:14   #31
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Energy Solutions Alberta adds another suggestion: never let your car warm up more than thirty seconds before you start driving.

The EPA agrees, and states that longer idling actually causes engine damage. The owner’s manual in my Audi warns, “To avoid unnecessary engine wear and to reduce exhaust emissions do not let your vehicle stand and warm up. Be ready to drive off immediately after starting your vehicle.”

Conservation tip: Idle engines are the devil’s tools - | TerraPass: Fight global warming, reduce your carbon footprint

Harsh cold start environment
Cold morning starts present a situation that is hardly conducive to long engine life. The previous night, the thin hot oil has just washed off into the sump. Come morning, cylinder walls and cam lobes are bone dry. First crank causes fuel wash off of oil trapped in cross hatch pattern of cylinder walls, further aggravating the loss of lube film between parts.

Cylinder walls and crank lobes get their lube from splash and hot mist thrown up by the crankshaft, so a fast idle reduces camshaft wear and reduces bore washing (amongst other things).

In short - idling kills engines. Far far better to get in and drive.
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