armand, i drive an 04 f150 and hear the "tap" in the motor when its idling and when i give it gas in neutral. Over 2500 RPM, i dont hear it anymore. I spoke with a mechanic and he said to make sure and put the right amount and type of oil. My truck takes 8 quarts of 5w30 i believe. He said to check it often when you go on long trips. Its preventive maintenance on a 6000 engine.
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