I saw the first thread about this, and decided to start a new thread instead of reviving an old one. I have had coolant issues in the past, but I have had my mechanics blame it on a small leak in the radiator the first time, and the upper coolant hose the second (which seems to have been cut by the belt right next to it on my 96 3.8L V6 Cougar). After doing hours of research on the internet, it looks like it is a blown head gasket. The final test with be to watch the radiator coolant for bubbles tomorrow morning when I start her up. If this is the case, I have other problems to fix on this car, and therefore am coming up short on the 1K+ that it would take to get it replaced. Also, being a broke college student does not help. But I am willing to shell out the <$100 that the stop leak fluids go for. Now my question is not whether or not I should try these products, but rather has anyone had experience with them, good or bad, and what is the most thorough way to go about doing this. I am currently looking at Bar's Head Gasket Stop Leak and Blue Devil's version of the same product. Thank you in advance for your responses, and even though this is my first post on these forums, I will admit that they have definitely helped me with many of my questions in the past 18 months that I have had about my Lola.