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when you oil gets hot it tends to thin out. Say your using 5w-30 and when the engine gets warm it knocks it means either the oil is to thin or oil is not getting to that component. next oil chenge try using the lucas oil stablizer and see what it does. It should solve the problem but remember lucas oil oil stablizer takes the place of one quart of oil.

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Q: Why 91 350 Chevy gets a knock when oil gets hot?
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