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To OP, all e9x WP is electric. So I am not familiar with how it fails.
The old BMW engine has WP driven by belt and the bearings are known to fail around 60000 miles, usually precede by whining sound and small leaks around the bearing
The bearing is the weak point since it loaded by the serpentine belt.
So for your 05 325XI just keep an eye on engine temp and if it creeps up change the electric WP (but first I'll try to flush the cooling system to see if there is improvement). The MSRP for electric WP is around $400, ouch.
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