Quote:
Originally Posted by Sportsguy83
How does it do harm? (honest question)
AFAIK, one of the good things about warming up the engine is getting the oil closer to operating temperature where it has all properties to properly protect and lubricate the engine components.
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I was always taught to not idle a cold engine but drive it straight away and gently until the temp is up to normal. Also that it takes up to 30mins to get everything up to normal operating temperature.
Everything I have read about it confirms that to idle a cold engine for any time not only wastes fuel but causes harm and i've just done some more googling to double check.
Basically, a cold running engine is bad news and you need to get up to temp as quickly as possible but on minimal load. To let it idle keeps it cold longer with the rich mixture causing wear to the cylinder walls.