Interesting, but it doesn't make sense. If you look at the ordering guide for the US versions of the 528i and the 535i, you'll see that ZDH is a different package for the two different models. In the 535i, ZDH includes the adjustable shock absorbers (dynamic damping control) and the adjustable struts (adaptive roll stabilization), for a MSRP of $2,700. In the 528i, ZDH consists only of the adjustable shock absorbers, or dynamic damping control, and the MSRP is $1,000. It's possible, I suppose, that the extra $1,700 in the price for the 535 is for nothing, but I think it's unlikely. More likely is that BMW's explanation of this is (as so often happens with their promotional material) garbled and confusing.
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