So you have checked the injector correctional values with diagnostics? If there is a large fluctuation on some injector correctional value it could simply be caused by poor contact on injector connector plug and rectified with new connector pins.
What age E53, M57 or M57N engine?
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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
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