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People are pulling 1, 2, 5 ounces of gas/oil/water mixture out of their catch cans. The thing is, the vast majority of that would have been combusted in the cylinder, and most of the coking would have occurred when partially combusted gas/oil refluxes back out of the cylinder and onto the valves. Motors with catch cans STILL exhibit coking on valves, so how does anyone explain that?
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