Engine Burning Oil Problems of BMW 530

I have a 2006 BMW 530i that has been leaking oil for 3 years. I have had work done on the car from an authorized BMW shop and the leak was not fixed. I have had excessive oil consumption to where I have had to either put oil in the car myself because it was at the minimum level, or take it in to the dealership (if I'm in the area) for them to top it off. I have taken my car back to the dealership 4 different times and they have told me that they could not find an oil leak. Recently I took my car in for an oil change and they told me I had a leak in 3 different places. Since I have been told different scenarios, I escalated the issue to higher management and asked for an answer as to why two different mechanics at a dealership that specialize in the "ultimate driving machine" gave me three different diagnostics. They then told me that my car has a broken bolt which is common for this model, but refuse to rectify the situation and the vehicle is under extended warranty and neither will pay the cost.

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I have left my car at the airport for a 2 day business trip. When I drove back from the airport, while on the highway, I saw a big plume of smoke coming from the back of my car. The engine kind of hesitated but didnt' stall. I was able to drive to a safe place and check the oil dipstick. There was no oil left in the oil compartment. When the engine cooled down I saw black liquid dripping off the exhaust pipe. The car smelled like burnt oil. I spoke to the dealership that services my car and they told me to tow it to avoid any further damage. The dealership identified the problem as a frozen oil separator that created a vacuum lock and pushed the oil to burn thru the engine and the exhaust system. From further discussion with the dealership service advisor and looking into BMW posting forums I realized that this is an issue that has been happening for a while now with Bmws in cold weather conditions. I also found out that BMW has released in Feb 2009 a service information bulletin sib 11 08 03 that recognized, that the defective part may fail in cold weather conditions, and recommended to BMW service depts replacement with a new better designed part. However, BMW did not take the step to notify customers who have been or could be affected by this defect. If I knew about this issue in Feb 2009, when my car was under the new vehicle warranty, I would have replaced it at no cost and the engine and exhaust would not have gone thru this nearly destructive incident. I now had to incur this $1300 repair cost and I dont know what else could mechanically incur with this car in the future due to this malfunction. The resale value of the car has also gone down as well. I feel BMW has acted irresponsibly, if not criminally, to not notify affected customers about this defect. It could have been much worse driving in the interstate and having a stalled engine at 60 miles an hour.

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