You add this every day? Do you need to top off the oil?
I have always understood that stop-leak products just made a mess of the entire system. I found this: "Products like that work by attacking the seal material, causing it to swell. You can get a temporary one-time fix. It won't work again if (more likely when) the leak re-appears. And, of course, seals that were not leaking in the first place also get attacked."
Blue Devil rear main sealer review - RX8Club.com
Good luck!