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I've never used it myself, but in the may 1998 issue of Drag Racing Monthly, David Vizard recommends a product called TK7. He explains that the TK7 is a fuel additive that, when burned, becomes an upper cylinder lubricant. He says this stuff is sold in bulk to poor countries to offset poor fuel quality. It's supposed to reduce emissions and prolong engine life. Like I said, I have not tried it yet, but plan on getting some soon to see if I notice any difference.
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