Mayhaps ... but I have still never seen nor heard of any substance that legitimately "soaks into metal." And besides ... what would be the advantage of something soaking into the metal of an engine, anyway? Friction occurs primarily on the SURFACE of engine's metal parts, so unless this ZMax crap can somehow miraculously alter the metallurgy of an engine in such a way that it, like, cools the thing better or whatever, I fail to see how it would really benefit jack. The claim still just sounds completely dubious.