Following on from my earlier post about excessive oil consumption in my 2005 X5 4.8is, the problem have morphed into something worse - smoke from the tailpipe during idle. I've asked around at some independent shops, and their initial thought was that a ring or gasket of some sort may be the culprit. However, after 5 days at my local dealer here in Florida, they could not identify any of the normal issues that lead to oil smoke. And, for some reason, they also were unable to re-create the smoking situation while they had the car. (interesting) Of course, when my wife goes to pick up the vehicle from the dealer, it starts plumming smoke. After another day or two with the car, their hypothesis is that oil is somehow bleeding into the valves, and to repair it would be "woefully expensive" (their words). Estimate $6k!!!! Anyway, I wanted to know if any of you have had any similar problems? Or, do you think there could be another explanation for the smoke? Also, if you have heard of oil bleeding into the valves, do you think its worth trying to repair it at an independent engine specialist shop or do you think I should cut my losses? The X still runs very strong, and the smoking only occurs during prolonged idling after a day of around time driving. Thoughts?