well they still used it as of last year when I had to replace a manifold gasket on my suburban. I couldnt place blame on it directly but it may have played a part in that problem.[the engine had a timing/backfire prob.] I didnt know anything about dexcool until i happened to look up the problem on the web, and found out it being suspect in many gasket failures. I used a product from NAPA.
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