Yeah, with the low cost of the part, I'd replace it while I'm there too!

I've read the Behr vs Wahler debates and was leaning towards Behr though. The Wahler design IIRC puts the wax and electronic heater element outside the housing thus needing a seal between wax element and main housing, and they sometimes leak at that seal. The Behr design puts everything inside the housing. Any particular reason for leaning towards Wahler?

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04 X5 3.0i auto
03 X5 4.6is