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Old 28th July 2006, 20:32   #16
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At idle rpm the oil pump is supplying fuel at less pressure then at regular operating speed.So i guess if the engine is idled for a long time at idle rpm it could lead to more wear and tear of parts due to less oil pressure.
This is my take on this and i could be wrong.
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Old 30th July 2006, 10:53   #17
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There are 2 reasons why excessive idling could / should be avoided.

1. All the modern cars are semi air-cooled, i.e a thermostatic electric fan works part time only. Hence while idling, iff your radiator / cooling system is not perfect, then you will have this overheating problem as the electric fan may not have the complete capability to keep the engine from boil.

2. A general thumbrule is to switch off the engine if we were to stop for more than 2 minutes..to save precious fuel as well as help avoid pollution to fellow road users..This is true in cities like Bangalore where the average time between traffic lights is in excess of 2 minutes.
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