In the 530d demo car I had a few months ago. I tried an experiment.
The car was started and I walked away from car and noted it carried on running. I should have found out when it would stop the engine but didn't have time. I may try it when I get mine.
New Company car 2011 BMW F10 520D SE Xirallic Imperial blue/Cinnamon Brown 6FL USB, Front Sports seats, Sports steering wheel, Xenons - Arrived 3rd Dec 2010!
Scrapped RIP 12/08/2010 - E90 320si - Le Mans Blue - Totally standard specification
Long gone - 00 Peugeot 306 2.0 SE Cabriolet, 94 Rover 214 SEi, 91 Fiat Uno 60S Mk2