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Idleing IS bad, esp. after warmup b/c... (archive)

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Posted by Vin on October 06, 2000 at 00:00:35:

In Reply to: That one I buy...not "idling is bad"...... posted by Scott Snider on October 05, 2000 at 14:58:03:

the engine cooks just sittin there with no airflow to cool it. Thats why cars overheat in bumper to bumper traffic......

BMW and most other manufacturers all suggest that warm-ups are not necessary and the prudent thing to do is drive slowly for the first few minutes and gradually increase speed as the engine "warms-up". I think the reason for this is strictly economical in that, idling is wasting fuel and decreases your MPG. Most manufacturers (SUVs excluded) have a target for their published MPG ratings and anything that can be done to meet or improve this rating without adversely impacting vehicle reliability will be policy. My opinion.

i think in the owner's manual, it says after starting your engine, not to warm up the car to driving temperature before driving it. why is this? and how long SHOULD you warm it up then, if at all you're supposed to warm your engine up?

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