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vehicles with radiator fans on timer or thermo switch should have no problem, as long as it is idling reasonably. older cars with a large enough radiator with gear, chain or belt fan shouldn't fair as well, though would still be adequate. radically tuned vehicles and big block hot rods may have to keep moving to maintain the scrubbing effect the air has on the radiator fins to keep temperatures down. When heating and cooling causes rocks to erode, starting and stopping a motor causes wear - a taxi does more Kms in its life than the life of a normal workers vehicle before an engine rebuild is warranted. The impact of running a car at idle for some time is pollution, empty tank, pointless engine wear, and noise pollution.

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Q: What is the impact of running engine at idle for a long period of time?
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