[bsw357]

This is probably a few years too late, but scorings on the cylinder wall especially on the #6 seems to be caused by broken Wrist Pin clip.
While lubrication of any components are very important, K&N filter or Delvac oil won't induce Wrist Pin clip failures.
Should be covered by any warranty that coveres lubricated internal engine components.
If the cause of the scoring was due to a bad motor oil, all the cylinders will have same type of damages.