I'm in many situations where it is either very hot or very cold out. I travel quite a bit with my Passat and when I stop to take a nap, or watch my children play/practice or stopping to observe various things I have the car idleing for different lengths of time. It can be 15 minutes or it can be an hour and most of the time it is after the car has been running awhile and warmed up.
Does this do damage to the engine? Is there something that could be done during this idleing period, like revving the engine a few times every 15 minutes, ect ?