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When you changed the oil after you initially heard the knock did you find any metal shavings in the filter or oil? If you didn't notice, go out to the car and pull the filter and check to see if you see any shavings. Use a flashlight and pull the fins apart. The shavings will be obvious, it'll look like specks of gold. My friend that blew his motor recently had a lot of metal shavings in the filter when we checked
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