I think ill be changing my battery out to this summer as it doesn`t want to crank the x5 when it gets to -30c I have no idea if its ever been replaced or not ,I would think so considerring the x is 10.5 yrs old I will check the date code on the old batt.

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2003 bmw x5 3.0i ,219000km build date 2003-08-18