ISO 5163 - Motor Octane Number
We perform gasoline testing by ISO 5163 to find the motor octane number, which is combined with ISO 5164 to determine the antiknock index of gasoline. Motor Octane Number correlates with commercial automotive spark-ignition engine antiknock performance under severe conditions of operation. Motor Octane Number, in conjunction with ISO 5164 - Research Octane Number, defines the antiknock index of automotive spark-ignition engine fuels, in accordance with Specification ASTM D4814. The antiknock index of a fuel approximates the road octane ratings for many vehicles, is posted on retail dispensing pumps in the United States, and is referred to in vehicle manuals.
You can learn more about this test standard, or purchase a copy, by going to the website for ISO - the International Organization for Standardization.