A while back I believe Slick 50 or an other company with a similar product, sold an "aircraft quality" version of the same thing. There seemed to be two outcomes after it's use: (1) The engine ran great and had better fuel economy. (2) The engine ran great for 10-20 hours and then failed completely. After a fairly large number of failures the stuff was pulled from the market. The oil companies put enough additives in the oil already I'm not going to add anything to the mix.