I agree that the motor is not sealed and likely never was. And number 4 is the worst offender. The rings also appear glazed. Maybe the picture, but the hone job looks terrible and also there is some scuffs in the cylinder where the skirts have been touching off. That could be from two things......One, it's either just TOO big and the pistons are rocking in the bore.......or two, the oil contamination is diluting the fuel charge so much that it is killing the octane rating and rattling the motor. A motor that is oiling will NOT need more fuel. It will need less fuel because it is making no power because of the blowby.