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There is no "mechanical failure" per se with the VANOS units....the rubber seals in them become degraded, allowing the cams to advance prematurely, which causes reduced performance, poor idling, etc. Replacing the seals with the Beisan Systems kit is the best way to cure this problem. It restores power and gives smoother running engines. I say go ahead and do it, ALL BMW engines need it beyond 50,000 miles.