Speaking of valve stem caps, I've always used chrome ones (not the cheapies), I have them on my 370z, and it doesn't see much rain, it's my sunny day drive, but I also had the chrome ones on my 2013 Nissan Frontier, and they are prone to corroding. I went to check my tire pressure cause the TPS came on, and when I removed the cap, the entire valve stem was corroded, and came off with the cap. I was fortunate that the dealer replaced the TPS under warranty, but I now use rubber valve caps. As you know TPS are expensive to replace.
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