Thanks Rockit, looked at their cooling system overhaul kits. They dont include the expansion tank to aux water pump hose, and the left/right core hoses.

Your interval sounds about right. We have a 2003 4.6is here with only about 28,000 miles on her blow a cooling system hose the other day. Got me thinking as though I just finished overhauling my own cooling system, I didnt change out the heater hoses.

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04 X5 3.0i auto
03 X5 4.6is