Crankcase (pcv) problems of the 2005 BMW X5

I bought this SUV last week for my kids to drive after researching and test-driving various makes and models for months: BMW X5 4,4i, mercedes ml430, Porsche cayenne, and Jeep grand cherokee. The BMW won in the end because I have had several 3-series with 200,000k on it that run like new. The previous owner assured me that there were no problems with this SUV and sold it to me in as-is excellent condition. She also assured me that it had been serviced by a BMW dealer with a full inspection on June 13, 2013. I also had it inspected by an indy mechanic. Two days after I bought it it started blowing clouds of blue smoke on acceleration, intermittently. I immediately contacted the seller who told me that she had mentioned this to the BMW dealership during the June 13, 2013 inspection, and that they could not detect or isolate the source of the problem but, they told her that it was nothing to worry about. I then contacted the dealership to pull the service records which verify this to be true. Upon researching this issue online, I found several technical service bulletins about it (pcv, ccv for the n62 engine and osv for the m54 engine) as well as hundreds of complaints from consumers - everything from blowing smoke to blown engines related to these pressure release valves. How can a dealer not know to check the pressure release valve when there is so much consumer history and technical literature on it??? this just blows my mind!!! I would not have bought this vehicle had I known about its pre-exiting condition because I would have researched it and been scared off by the degree to which people have been affected / hurt by it! this is clearly a design flaw. What will is take for BMW to get its #$&* together and recall vehicles affected by these m54 and n62 engines!.