I own a 56 -210 w/406 chevy. Added Oil extreme- Concentrate to my oil. Has anyone tried this stuff? A lot of claims on their web! , seems to work great. My oil pressure went up, my heat went down, engine quieted right down, and I think my power went up. The engine is also noticably smoother. I first read about it in Stock Car Racing magazine in an article by David Vizard. I race on the weekends. Bill