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Won't ruin the engine itself, but it will eventually ruin the vacuum system. The oil will ruin the vacuum lines, diaphragms in the climate conrols/door locks/etc. If you have total vacuum pump failure, you will have no power assist on the brakes, climate control will not work, transmission will not shift properly, engine will not shut off without pushing the "stop" lever under the hood, locks will not work...many many issues!
If you're that unfamiliar with the vacuum system, I'd advise taking it to someone experienced. Let them diagnose and repair it, and hopefully you can look over their shoulder and learn a few things about it in the process.
Mike
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