The oil wear test is also what you might call a blind test, in that the test equipment does not know what oil it is testing, it just tests them all head to head. It doesn’t care what brand the oil is. It doesn’t care if it is a modern API certified low zinc oil or an older type traditional high zinc oil. It doesn’t care about how much detergent is in the oil. It doesn’t care what the Lab Test print out shows. All it cares about is the size of the wear scar generated. The smaller the scar, the better the oil protected against wear, and the higher the psi value.