Will noisy lifters make the motor sound like It's knocking, or is there something else I should be looking at. It does it at idle and under light load, but when under heavy acceleration it does not do it. I am running motorcraft 10w30 syn blend with a motorcraft filter. Also change oil every 3000 miles. Just getting some ideas since this motor only has 64,000 miles and hoping i can get well over 100,000 miles thanks.