I'm not quite following the correlation of CCV and EGR. On M47/57 engines the CCV is quite trouble free. On early versions the oil separation loo roll should be renewed regularly but the vortex separator on M57N is virtually maintenance free.

I've disabled EGR on all M57 engines mainly to prevent the soot mess in the intake system. This can easily be done by just unplugging the vacuum hose on EGR valve. On early versions that's just it (It will show a code with diagnostics, but doesn't cause a warning light or limp mode.). On later models this will cause a fail safe mode and has to be mapped out.

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E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey