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yup - while generally impervious to oils and such, unlike rubber which soaks it up and gets ruined, they squeak with the least provocation. i have had some graphite inlaid ones that weren't bad, but they don't seem to be on the market anymore. even delrin makes noise after a while. there really isn't a perfect material. if you aren't racing though, rubber is the best material, assuming you have no leaks which would contaminate them. yes, there is a minimal performance benefit with other materials, but at the expense of noise, which in a street car, can be the difference between a pleasurable ride and an annoying one.
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