Catalytic converter on a diesel engine

What year did ford start fitting an Oxidation catalyst to its diesel cars? And does anyone know what is the expected life span of these catalyst?
Peter

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In a perfect world It will not degrade. It's not just Ford ( actually not a Ford engine but Navistar if in the U.S. ), but many manufactures of diesel are using catalyst now because of tightening emission standards on diesels. Many are now equipped with EGR as well.

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cars?
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catalyst?
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