Engine wear
Idling damages your engine components ...

...including the cylinders, spark plugs and the exhaust system. When an engine idles, fuel residue builds up on the cylinders, spark plugs and exhaust system.

An idling engine is not operating at peak temperature, resulting in incomplete fuel combustion. Fuel residues can condense on cylinder walls, contaminate oil and damage engine components. With more engine idling these residues tend to deposit on spark plugs. The resulting plug fouling can increase fuel consumption by 4 to 5 percent. Excessive idling can also cause water to condense in the vehicle's exhaust. This can lead to corrosion and reduce the life of the exhaust system.

Residue from iling leads to costly damage and decreases the car’s gas mileage. Idling is bad for the engine. On the other hand, frequent restarting has little impact on engine components such as the starter motor and the battery.*

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