mac wrote:
>
> I used to think idling (maybe more than 5 min) was bad for engine, but
> then I read elsewhere that it's no worse than driving. I think i read
> that idling with AC on puts alot of stress on the engine. Is this
> true? Should I turn off the AC if idling for more than 5 minutes? I
> have a dodge truck, and ideally I could sit in it for 15 minures,
> idling, with AC on...
>
> Also, in the winter, is idling with heat on any problem?

When I lived in West Texas the company bought me a brand new
Chevy 4dr truck. We (me & crew) used to leave the truck running in
the summer for the A/C and in the winter for the heat.
The engine lasted 9 months before it wore out. The next guy that
got it had it for 1 year before it needed a new engine.