I stopped by the Royal Purple demo tent at the local auto store today. he had his bearing tester with the weights. "Sir would you like to see a demo of RP oil"
"Sure" I said.
"M-1 ,or QS" he said.
M-1, I replied.
He put M-1 5W30 in the cup added the weights and the motor stopped at 8 lbs.
He...