friction cooeficient and friction modifiers

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We know that different oils have different friction modifiers to be more slippery or less slipery, depending on their intended use. - Does anyone know of a good reference on what, how and how much for different friction coeficients? - How hard would it be to make some kind of a test rig?
 
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FM do appear to make a difference as far as fuel economy. It's finding it's way into HDEO's even in an effort for increased savings. Just how it works, [I dont know] . Is it on a molecular level during flow? Is it due to surface interaction at lower temperatures than things like ZDDP would have some effect, with the surfaces that are being lubricated? Good topic.
 
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