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Here are some screenshot from a magazine article called Oil ain't Oil where they put to test various brands of engine oil

The test was carried out with a test equipment to measure film strength properties called the Falex Lubricity Tester which gives results similar to 'Timken OK Load Rating Test'

The maximum load - in pounds - a lubricant could withstand without failure due to breakdown of the lubricant film became known as the 'Timken OK Load' rating and is still an industry...