I picked up my z34 91 Lumina a couple years ago, it had a blown head gasket, I ran some bars transmission leak in it, the silver powder.. Sealed me right up, I ran the silver powder at about 150K miles. I now have 189K miles on it. Only Major things I have done to it where radator leaks and regular matenence. Sealed the Radator with egg whites, witch workes real well actually. Recently did a Transmision filter change, and sence then my lumina has been making a weird humming noise, but it hasent blown yet.