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Have you looked into ceramic coating.
"PPM – A thin, high load solid film lubricant used for parts with little or no room for a coating. Bearings and other parts are often coated with PPM. Applied about .0002” thick."
a company called swain tech does it. There are actually a lot of engine parts that can be coated to improve drive train efficiency. I've been looking into it lately and seems like there are a lot of promising developments in ceramics that could help Eco-moders out there.
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