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I'd like some tips (additives, etc) on what I can do to ensure my car passes it's next California smog check next year, since it seems it barely passed it's last check. It's a 99 Mazda Protege with 320k miles. It was sitting for about year when I put in a newer engine (with 94k miles) earlier...

Got a situation with a '99 Mazda Protege 320k miles that keeps rusting out the radiator. Local shop says that water must've got into the engine at some point and that rust in the engine will keep spreading into the radiator. No way to remedy it. Their recommendation is to put a new engine in it...