Same here, my 05 didn't have a knock when I first got it. After first oil change I switched to Mobil 1 synthetic blend oil with a FRAM oil filter, there came the knock. I dropped the oil after two thousand miles and went with full synthetic Mobil 1 with a BOSCH premium oil filter, knock disappeared. I would believe that it was the oil filter change that did it rather than the change to full synthetic oil.
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