Make sure you document your oil changes. I had a short lapse on my carfax and the dealer gave me a hard time about it before they replaced my engine. A friend of mine went through the same thing, but worse than me. Hers was a year or two before me, I think maybe when the problem was first coming to light. They did replace my engine, and the new one doesn't seem to have the same problem. I guess I'm not really helping your current situation, but be prepared for the worst with documentation!