Dont have the 4.6is while thats older, and with age comes more wear and tear for people who use them normally...

It all really depends how you keep your cars, my 4.8is is a daily driver for me, but the paint always has protection on it in the form of a sealant / wax or both, regularly detailed and cleaned, and maintenance / fluids done on time and always fresh..

I believe the above is really the recipe for keeping any car in good shape, and the plus factor is you can use it and still looks like its a garage queen. The only thing that really gets wear is the front end from road rash (which mine almost has none except on the bottom of aero kit in front where its not really seen, with 97k miles and northeast winters), and the drivers seat which can be re-finished in the future if it gets bad.

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2006 X5 4.8is Fully Loaded