Thanks for all of the helpful tips Ismalley. The car in Oregon already sold, but the information you provided will be helpful in the future. I've only operated diesel automobiles for the last ten years, so all of this smog stuff is relatively new to me. Replacing a cat in California is costly because a specific/expensive type is required. If I get access to a test sheet from a car that has failed, are there certain numbers that signify a bad cat? Are there certain numbers that tell you the engine needs to be overhauled and you should walk away? Thanks

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'81 300SD