Saw the new line of Supertech additives at Walmart a couple weeks back. Generic Lucas, seafoam etc. I tried the Supertech Upper Cyl. Lubricant fuel additive and it actually works. Made a noticeable difference, I was shocked. I put some in my mower and pressure washer that have a pretty lax maintenance schedule and it actually smoothed them out at idle and load. I put some in my BMW and I don't know if it did anything. It didn't have any problems to begin with.