Yeah I should definitely have a torque wrench in my shopping list, already have a 1/4" one but not much of a use for car related stuff. Still wondering how I would have left the lugs so loose while even after the rechecking they were okay but I guess they were still a bit off which allowed them to loosen even more.

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09/2003 X5 3.0i
02/2003 X5 4.6is (non-runner)