Thanks Kevin for your input. I did a search and found Royal Purple's SJ oil did use a ASTM D-2782 test machine. Here is a quote I found on their API SJ oil testing:
"Greater Wear Protection - depends on the protective oil film not breaking down under pressure, preventing sliding surfaces from coming into contact. The ASTM D-2782 "Timken O.K. Load Test" measures an oils ability to prevent wear under load. Other premium motor oil films break down under a 20 lb. Timken load; `RP' carries an 80 lb. Timken load . . . a 400% performance improvement. `RP's super-tough film has extended engine life 300% or more in severe service."