ORIGINAL: miniman
OK I can posibly go with that argument on an old motor where the cylinder has worn, or has been distorted due to overheating, and you want to fit a new ring/piston. But on a brand new motor, are you telling me the manufacturers do not make the cylinders round?
Ideally the cylinder and ring of a new engine fit perfectly and are perfectly smoothed out but this is never the case, especially with cheaper engines like DL.