I have OEM metal caps on my M6 reps with TPMS - works just fine. That said, the dealer told me that there's a possibility that they'll corrode and be hard to remove, but a year later they're still just fine - not seeing any corrosion or anything unusual at all. My car is in a climate-controlled garage day & night though so maybe that's the difference. I work from home so my car rarely sits outside for any lenght of time.
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