We'll most think that the "don't idle it will kill your engine" argument is a treehugger approach to stopping this insanity. The true is:

• Engine idling destroys your engine (Gasoline and Diesel too!)
• Engine idling accounts for over 30% of the fuel used daily in the US - this waste is driving the cost of fuel higher.
• Engine idling produces worse air quality hazards because and idling engine runs colder and colder engines run dirtier.

If you don't believe me here's a very telling piece from the Bus Conversions forum on Diesel engine idling, from an authority: Detroit Diesel, motivated by a casual reader asking, “How long should a diesel engine be warmed up before driving off?”

Read the full at www.busbuilding.com

and read The real cost of idling your car!