X6 is the same as the E70 X5. More posts in that forum, so read up on it there.

2010 models are all still under warranty; not sure if your 2003 was recent or owned back when it was newer.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue