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“Because the engine isn’t working at its peak operating temperature when it’s idling, the fuel doesn’t undergo complete combustion. This leaves fuel residues that can contaminate engine oil and damage engine parts. For example, fuel residues tend to deposit on spark plugs. As the amount of engine idling increases, the average temperature of the spark plugs drops. They begin to gather dirt more quickly which, in turn, may increase fuel consumption. It’s a vicious cycle of wasted fuel and needless greenhouse gas emissions. Excessive idling can also allow water to condense in the vehicle’s exhaust. This can lead to corrosion and reduce the life of the exhaust system.”

Very true! Good article!