You should still be under warranty no? I know you're in Europe, but isn't it still 4 years?

I don't know how much as mine is warrantied till 2012. Is yours an '08 model built around January '08? I know of one other around that time who had the same issue... maybe a bad batch.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr