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The knocking noise has to be a deep knocking noise if its the crank bearings . If the oil is very gooey the oil was never changed properly at the mileage or months as required. Also if the oil is thick as you state it must have 15,000 miles or more on this oil. 10,000 miles the oil will still be thin if never overheated. I suggest this engine be completely disassembled and inspected if you plan to keep it. You will find wear to more to it especially the cam shaft, lifters, rocker arm as so on. for the oil never lubricated the engine enough to save this engine