The rep I talked to said something about the film breaking down and "cooking" into a waxy substance when used in a hot/wet environment. We didn't get too technical about the discussion, I just asked about the use of PTFE in motor oil (some companies use it) and he said they weren't advocating it.
If you look on DuPont's website, somewhere, there's a short blurb about it, also not technically specific.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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