I bought an 05 3.0i Petrol X5 Sport fully loaded recently and I have to say there has been alot of improvement in quality and reliability compared to the older(pre 04) models. You may not notice them but I'm sure if a dealer was to point them out to you, you'd see the differernce for yourself. Are you driving a 5 speed manual at the moment and thinking of going for another manual with the upgraded 6 speed gearbox??

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'05' X5 3.0i Auto Sport Black/Black Fully loaded