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This is a much discussed topic now and others will chime in, related to the plastic timing chain guides that cause the timing chain to stretch and break. Sounds like this happened to you. I believe that BMW has extended the warranty for this issue to 7 years 70k miles. Call a BMW dealer to confirm this and hopefully you are covered, but sounds like you are at 100k?
I too have been concerned about this and had it looked at by a tech who says all sounds god, but could happen without warning I suppose. Did you notice unusual noises prior to this?
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