I have a 4.6 with 114,000 miles. I purchased it new. I have had very few problems. I am almost OCD about taking good care of it other than driving hard all the time. That said, I don't think it helps much to do comparisons because of the huge number of variables from one vehicle to another and the environment they are in.
I suggest you have a complete inspection done by a well recommended Indy shop that specializes in BMWs to see where you stand. I think particular attention should be paid to suspension components and state of all fluids.
Before the inspection I would check or have it checked for error codes. If there are any have them cleared and have the inspection done a few days of driving later so the shop if any have returned they are new codes.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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