Q: Engine knocks as a result of a valve problem

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While driving onto the freeway, the valves started knocking severely and very loudly. I regularly change my oil with top quality engine oil. I visited a couple of auto-repair shops and both places stated that the engine needs to be replaced. They both said that the valves are worn out; plus, they heard a sound in the bottom of the engine. This information seems unbelievable to me. Please tell me what to do.

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