Found this display inside the Zentrum.Timely given the X5 and 3 Series Diesel launch coming up soon.The 3.0L TT Diesel is a physically large engine.The plastic tank next to the exhaust pipe is the urea injection system that chemically changes the diesel exhaust emissions.BMW calls it AdBlue injection.Should get approx 10,000 miles on a tank of urea solution.BMW will cover the AdBlue under the BMW Maintenance Plan.The car will shutdown and become undriveable if a series of low AdBlue warnings are not heeded.To read the timeline on the last page use X3 Large. Thanks! PalBay http://palbay.smugmug.com/gallery/6312617_LrXFq//398088910_7g7TE