Just took my '98 to the dealer today for an oil change & rotation. They notcied the clicking noise from my engine and told me that the infamous cam tensioners needed to be replaced. Ford recently issued a TSB/recall on these. So the work is now free under an extended warranty for owners of that engine. If you already paid to have the tensioners replaced, Ford will reimburse you if you bring your VIN and paper work. The recall is issued for certain production plants, so that's why the VIN is required. Any Ford dealer with their Oasis system shuld be able to help you get your money back. I also heard that the extension to the warranty only covers the tensioners and possibly the manifold intake too.