The better oil test; Seeing is believing; just add weights (pressure) until weak competition oil can't hack it any more and surrenders to friction

His accent masks the way he said that after 3 hundred pounds, "it fails". The Mobil One oil that is. Not that the ordinary lifter springs are 100 pounds of pressure on the camshaft, but they are over 100 pounds of pressure on most mild performance engines, like my double spring 906 heads on my last 383. And the whole point of showing the pressure between the two surfaces, and when the oil fails,