Ummm, is this similar to an Amsoil 4 ball wear scar test?
I didn't find any test data specifics, such as numbers, temperature, hardness of material used, etc. Using an old "dial-a-guess" calipers for measurement, is anybody's guess as to what the actual wear scar size was.
I wouldn't use this test to judge quality of motor oil at all.
It's a Timken type machine that tests the Extreme Pressure properties of lubricants.
Sometimes called the Pin and Ring test. A lever arm with a calibrated weight forces the pin (a roller bearing) onto a spinning ring, usually a bearing race. The less wear on the pin the better the fluid.
Not much info other than the machine pictures and oil cans.
I would like to know what criteria the oils were judged?