Originally Posted by JCL

The '08 emissions standards are tougher, hence the need for urea injection on both the MB and BMW models. Expect the mileage to take a hit, but it shouldn't be a big factor. More important to me is that these will be new generation engines, with the related first-year problems. None of the current generation of BMW diesels will meet the '08 standards. When they come out in late '08 (still a rumour, but with the press releases out a pretty safe bet) you can be on the bleeding edge. While BMW has built lots of diesels, they haven't yet built this generation.

Hmmm, rattles on start-up, no revs, first model year for the new engines, and theoretically a reduced engine life due to the higher peak cylinder pressures. Just get a 3.0 twin turbo petrol engine when they come out, IMO.