Poster, I sent you a PM. I don't know how big a big leak is, I was losing more than a quart every 1000 miles, but not adding a quart a day either. But it DID help a bunch, better than other stop leak products I tried with little benefit. The WS impressed me, I wouldn't bother trying other stuff again. And for those reading this, I didn't have the leak back during the summers I drag raced my csvt, the bigger leaks showed up a few years later, my leaks have been very tiny in the years I have since used the WS.
If anyone wants to set me up with a 3L to do leak research, I'm game. I could race it a while just to help the process along...