Fellas, please keep in mind that when you mention a brand name in lubricants you are really aiming at a moving target for a certain time period, corporate ownership, theories of formulation,movement in the industry of chemists,technologists,financial realities, etc..
Shell is attempting to make Pennzoil and QuakerState formulas of very high quality but to talk about running a brand name does not acurately describe the chemistry that engine was seeing.
If you watch my commentary here and on Noria over the years you can see a progression through brand names that are showing well or not. Its because of those variables mentioned above. I am in the business of getting the best for my customers whether it is Shell or Patman!