Agree with JCL. Change rotors with every pad change. For the reasons already mentioned and OE pads are soft for improved stopping difference and not that thick out of the box. Thinner rotors means they get hotter sooner. The hotter they get the poorer the braking performance.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas