How are big rig Diesels so easy to start?

[coldwar]

It baffles me why I have to glow and crank the hell out of my OM617 when the temperature goes a bit below freezing, while the guy up the street from me with his new Sterling (not sure what engine is in it) just has to hit the key for a couple of cranks, and it roars to life. Although I must admit, I've seen lots of big rigs starting hard, with enough white smoke belching out the stacks to make you think there's a forest fire. Is this just a case of the new Diesel technology?