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Gentlemen:
Very active concern on my mind in terms of threats to long term ownership of this car. N55s with build dates of March 2010 through December 2010 are affected with the old Vanos bolt design prone to shearing.
For those who have had the bolts fail, the replacement part pursuant to the sib is a revised design, less prone to failing. I have spoken with my SA several times about this issue, with the n55 being a workhorse he has seen many failures across model ranges, but if memory serves me correctly from my discussion, only one x5 that had an issue with the revised part. This failure from what I recall was speculated to be due to a number of other ongoing issues with that particular vehicle and can't solely be attributed to vanos bolts. In short, it looks the engineered fix has statistically resolved the issue from what my dealership has seen.
The revised bolts cost approximately $600 in parts from my understanding; dealer labor hours I haven't had quoted yet. I'm actively anticipating replacing the bolts even if everything is running smooth shortly before expiration of my CPO if I keep the car, but I have another couple years for that.
Out of warranty cost if they shear was quoted to me at about $4-5k plus the risk of more significant engine damage from bolt chunks running through your engine. I don't know how significant a job replacement with the revised part is, but I know it has minimized the shearing issue which has been represented to me as being quite prelavent among pre 12/10 production n55 engines.
I'll pull the revised part no's from my file when I get home-hope this helps. J
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