Age does a number on these parts as well. I replaced the rad on my 3.0 at around 40k miles, it's at 63k now.

The 4.6 is at 49k miles or so and already leaking at that area. Already replaced a leaking radiator distribution plate and a few leaking hoses at around 40k.

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04 X5 3.0i auto
03 X5 4.6is