The title of this thread cracked me up to no end...lol!! There's no such thing as a best X5, they're all bad to a degree, it just depends on your wallet/credit card pain thresh hold for the constant repairs...lol!!

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2002 X5 4.6is
1999 C5 Corvette
1992 Mitsubishi 3000GT VR-4
1994 Kawasaki ZX-9R
2005 Mazda 6 Wagon (Wife's)
1991 Mitsubishi 3000GT VR-4