Emissions is the only reason your manual says do NOT idle.
Don't know how good or bad it is, but in my opinion its better to let the car warm up for few minutes or so (1-2 maybe, wait for RPMs to drop). After all you do have to warm up the car to use full RPM range. And it is bad if you dont.
Truck drivers idle for several days sometimes, my first car Nissan used to idle alot, many times for straight 10 hours.........didnt have any problems at 165k on cheap dyno oil....
On my current car I usually wait for temp gauge to move 1 bar to start driving and rev past 5k only when car is fully warmed up
Last edited by Kolyan2k; 04-13-2013 at 08:49 AM.