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?