That weight is for the cars total weight with occupants and gas tank full or something along those lines.

I forgot the exact number our curb weight is listed at im sure a 3.0 with lighter wheels and such weighs less then my 4.8 but i know they list it at 5100 or somewhere close to there on car sites.

I actually weighed mine ar a warehouse that has the semi scales and it came in at 4960 without me in the car and 1/4 gas.

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2006 X5 4.8is Fully Loaded