[dmbrisket 51]

marval does some pretty neat stuff, we un locked a rusted up monte carlo moter with it once, ran for 4 years then totaled it out, but as sector said, no oil additive will fix a dying bottum or top end, if you have something as a rod knocking the best you can do is put 10w40 in it and drive it nice untill the inevitable happens, no oil additive or gas additive is reccomended except dry gas once or twice if you live in the snow belt, and injector cleaner once or twice a year ( i lean for once)