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Although I own a '22 540i, I don't know enough about these B58s yet. I do know more about the N55, and for that motor, I would do plugs and coils together. The problem is that when a coil goes bad, you can get stranded while the car tries to run on one less cylinder. Does your dealer want to do the coils as well? I would wait until 60k miles on my G30 for plugs and coils.
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