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Molybdenum disulfide (MoS2) does work wonders at lowering friction. Great stuff for things like CV joints. But it also breaks down at engine temperatures and ends up eating away the iron making iron sulfide. I'd imagine that WS2 would do the same.
The coatings I'm getting are Teflon based, or at least that's what I understand. Check out Swain Tech, for an example.
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