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Most likely you have induced irreparable damage to the engine. Consider scrapping the car.
OK, sorry, could not keep a straight face...
Your car is fine. How are you even hearing a knock when the computer has sensors that will detect the first hint and then pull timing out of the curve?
I doubt that even running 87 octane long term would harm the engine; most likely just lose a few of the high load horsepower.
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