I had the same issue at 55,000 miles and my service department went to BMW on my behalf and I was able to get the repair covered as goodwill. They covered 50% on a separate repair for my wife's e61 last year as well. My recondition is to at least ask the question. You may get lucky. My argument was low mileage and that I always brought it in for all scheduled maintenance to the dealer. That said, it's ridiculous that something like this happens in the first place.

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08 BMW X5 4.8i - GONE after 6.5 yrs
Space Gray / Light Beige
Premium, Sport, 20's, Technology
SAT, Rear Climate,Heated