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I've heard the same about bmw V8's. Nothing official but generally harder to maintain over the long run compared to the I6's.
I'm not sure what technologies go into optioned up 5er's these days, but from my own optioned up DHP f10 535i, I would stay away from active roll bars as there is high-pressure hydraulics connecting and disconnecting that bar to provide both the magic carpet ride and decent cornering. My indie specifically pointed to those as a risk at 60k miles and beyond.
None of these matter if you're not planning on long term ownership.
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