i'm going to re-check the paperwork and maybe go in and pop quiz the service manager and tech... see what reactions i get when i talk about not one but TWO tanks.
i love the amount of ideas that fly around regarding this, very helpful. this thread's info provides a great arsenal to use on the dealership.

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01 X5 3.0i (gone)
04 X5 4.8is (gone)
06 X5 4.4i (gone)
09 X5 35d (current)
12 X5 35d (current)