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After speaking to a BMW tech he told me that it is common problem on the n55. The vanos gear uses hallow bolts. The bolts tend to shear off and snap. The bolts that break off can cause some serious engine damage. BMW has made a new revised part with new bolts and a new vanos gear. From what he told me some cars with low mileage have issues. He also said he seen some cars with high mileage not have issues. From what I understand BMW does not want to do a recall because of the fact not everyone is being affected. All they want is the cars to experience the problem after the warranty.
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