hmmm was the car ever run low on oil in or before those passed 3 years? that is the number one cause of a spun bearing. pull the oil filter and cut it open with a can opener or with the special tool from autozone or your local auto store. look for metallic flakes. or you can pull the oil pan and check the rods for movement. since removing the spark plugs doesnt quiet the sound all of the rods are probably moving.
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