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I can say the Prolong's lubricant for accesories, the one that comes with the package, works pretty well. I don't know what it is made off, but it does work pretty well, but I don't think their claim of the lubricant bonding to the metal is correct since the lubrication is gone after a few days.

As far their engine lubricant, I don't know. I used to use it on my eclipse, but so far I haven't though of trying on my IS.
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