I used Slick 50 in a 1988 Chevy S-10 when it hit 100,000 miles. Put it in every 50,000 miles and drove that truck 368,000 miles. I can't verify that it was the Slick 50 that made it run so long, but I don't know of anyone else to get that many miles without a major overhaul on the engine.

Re; the Ethos product - They showed tests of before and after readings on emissions and it seem to help burn the gas more efficiently. I am going to try running it my new Hybrid Highlander and I will let you guys know if I see any improvements. It is a natural mineral that is safe and does not void warranty so why not try? I know it only human nature to be doubtful, but I'm willing to try anything that will help the environment and get us away from fossil fuels. Plus I bought the extended 100,000 mile bumper to bumper warranty so why not give it a shot?